30 years ago, 15 years ago, common communication methods and the time it takes to transmit information now.

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30 years ago 15 years ago, people often used communication methods and the time spent transmitting information: 27 reward points: 10 | There are still 12 days 18 hours before the end of the problem | Questioner: Xingxin 33.

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Answer ***2

Thirty years ago:

Hand-cranked telephone: the time varies, sometimes it takes several minutes to get through, and sometimes it can't get through.

Letters: It depends on the distance. At that time, the postal system was not very developed, and there were at least eight in a week.

Message: Well, one is the distance between the two places, and the other is the integrity of the message taker. At that time, you could only take the train. There are fewer cars and fewer planes. There is no high speed. At least one day, plus the messenger has to do something, which is estimated to take two days.

Telegraph: It's fast, but there's also a difference, ordinary or urgent. Never used it. The general estimate is 2 days, and the urgent estimate is less than 1 day.

It is said that there are also chicken hair letters. This ... needs more time.

15 years ago, that is, in the late 1990s. At that time, telephones were popular, pagers were available, trains were speeded up, planes were cheaper, there were fewer people sending messages, and there were no telegrams. In short, in general, the delivery problem can be solved within 3 days. If it is in a remote mountainous area, it is hard to say. You can't get out, and you can't get in ... Interviewee: bicaqu2008 | level | 201-5-913: 07.

beacon tower

In ancient China, in order to transmit military information, people used to set up beacon towers to transmit information with fire and smoke. The beacon tower burns wolf dung during the day and lights firewood at night. Legend has it that when burning wolf dung, a lot of smoke goes straight into the blue sky, which is easier to be found than daytime fire, so bonfires are sometimes called wolf smoke. Found the enemy lit a bonfire, spread from Taiwan Province to Taiwan Province, spread to the barracks. More than 2,700 years ago, the bonfire early warning system in China during the Zhou Dynasty was very complete.

Running a marathon is telling.

In ancient times when transportation and communication were underdeveloped, people had to rely on two legs or ride horses to transmit information. The marathon was set up to commemorate a hero who died more than 2,000 years ago and deliver good news. In 490 BC, the Greek army repelled the invasion of Persian King Darius I in Marathon Plain. Fidel Pitts, the messenger, ran from marathon to Athens, the capital, and reported the good news in one breath. When he ran 42.6438+095 kilometers, he rushed to Athens Square to finish the good news and fell to the ground exhausted and died. In order to commemorate the heroic deeds of this soldier, the distance he ran was listed as a long-distance running event at the first Olympic Games in the world in 1896.

Send information through the post office

The invention of writing promoted people's communication, and communication began from now on. As early as the Zhou Dynasty, China set up a special post station to deliver official documents, and rode the official documents from the post station to the post station. At the same time, a relatively complete post station system was established, which realized fast and accurate communication. After the Qin dynasty unified the six countries, the information transmission system of the post station was determined as the administrative organization of the country. Postal service transmits information at a speed of about15km per hour to realize long-distance communication. It was already fast at that time.

Pigeons and monkeys

In order to transmit information, ancient people also came up with many strange methods, such as drift bottles, signal trees, homing pigeons, monkeys and so on.

In Bekasa, Nigeria, people use monkeys to deliver letters. People keep the mother monkey and the son monkey in two places respectively, and often take the mother monkey to find the son monkey to let the mother monkey know the route. When people need to communicate, they put the letter in a bamboo tube and tie it to the mother monkey, so that she can go out and look for the baby monkey. The mother monkey can always deliver the letter to her destination.

Carrier pigeons have been an effective information transmission tool since ancient times. In today's highly developed communication technology, homing pigeons still have their own place. In war, communication is crucial. However, once a nuclear war breaks out, the strong electromagnetic radiation generated by the nuclear explosion will paralyze all kinds of existing electronic communication systems, but homing pigeons can still fly freely. The Swiss army trained and bred homing pigeons that can throw books in two directions. These homing pigeons no longer deliver traditional letters, but carry computer chips in capsules, and the password information in them can only be read on special equipment, which is extremely confidential. Carrier pigeons may even become special signalmen.

The emergence of the post office

It is generally believed that the post office was established by King cyrus the great of Persia. Ju Lushi ruled a huge empire, and the delivery of letters and information by messengers could no longer meet the needs of the empire. To this end, he established a postal management department composed of many post stations, which was the earliest post office. These stations are separated by a certain distance and are responsible for taking care of the post horses that run one stop every day.

China had a postal system long ago, and it was basically perfect in the Tang Dynasty. The Yuan Dynasty also rectified the system of post stations connecting the East and the West.

In 3 1 year BC, during the reign of Augustus, the Romans modeled such institutions and established public post stations. The station is equipped with post horses that feed grass and guest rooms for past officials.

In the Middle Ages, Romanesque post offices disappeared and monasteries spread all over Europe. The communication between monasteries is carried out by using parchment scrolls called "sacrificial coffins". The first monastery wrote their rumors on the scroll, and when they arrived at the monastery, coupled with their rumors, the scroll became longer and longer. For example, the scroll conveying the death of the abbot of St. Hueros is 9.5 meters long and 0.25 meters wide. People call it the Monk Post Office.

Qing Post Office was founded in Tongzhi period of Qing Dynasty (1862- 1875), and it was one of the thirteen post offices in Shanghai in Qing Dynasty. It has gone through different stages, such as private letter bureau, foreign post office, newspaper office, customs post office and Daqing post office. At present, it is the only remaining post office site of Qing Dynasty in East China, and it is also the epitome of modern postal history in China.

1878 (the fourth year of Guangxu in Qing dynasty), Yantai "Huayang Letters Library" set up a branch in Zhoucun, which was the predecessor of Zibo Post Office in Qing dynasty. /kloc-at the end of 0/900, Zhoucun Daqing Post Office opened. 1902 set up Boshan second-class Daqing post office, with two agencies and five mail counters in Badou and Xiye Street, including 2 village posts, 2 Yishui and Wangzhuang posts, and 4 Laiwu and Taian posts. On 1904, postal agencies were set up in pharmacies in Guang Shun, Xiguan, Linzi and Jiankangtang. The following year, Huantai set up third-class post offices and sub-offices in Zhangdian and Suozhen. Zhangdian Daqing Post Sub-office is located in Dongsi Street, Zhangdian Street, and handles letters and remittance business for merchants. Shizhou Village, Zichuan, Xincheng (Huantai) Town, Zhangdian and other bureaus belong to Jinan General Administration, while Boshan, Linzi, Jinling and He Zi belong to Qingzhou General Administration. ?

After the Revolution of 1911, "Qing Post Office" was renamed "Zhonghua Post Office". The post office is divided into four levels: postman, postman, postman and bureau clerk. The original Zhangdian Daqing Post Office moved to Nanbei Street. ?

1919 65438+10, Linzi, where Chunghwa Post is located, was established. It started as a third-class post office and was upgraded to a second-class post office in June of the following year. In rural areas, there are four branches, namely Xindian, Zihedian, Sunlou and Xiguan. 1920 In August, Huantai County Post Office (third-level bureau), Zhangdian Post Office (third-level bureau, later promoted to second-level bureau), Zhoucun Post Office (second-level bureau) and Boshan Post Office (second-level bureau) were established. Huantai County Post Office has letter boxes in Beishiqiao and Caocun Shantou Bridge, which are handled by merchants. ?

192 1 year, Boshan post office added two postmen to patrol outside villages and towns, divided into north and south roads, and toured for one week on the 3rd. Xihe, Yolanda, Badou, xia zhuang and Xingjiazhuang all have envelope cabinets. ?

1924, Zhangdian Zhonghua Post Office was changed into a second-class second bureau, and three private houses were rented to handle bills of exchange, insured letters and ordinary letters. There is also a post office in Nanding. ?

1926, Zhangdian Post Office moved to the original Zhangdian No.2 Road (now West No.1 Road) and added parcel mailing services. At the same time, mailboxes have been set up in Li Fusheng and Gu Wei, and mailing offices have been set up in Ma Shang and Gu Wei to handle small remittance business. ?

193 1 year, Xindian branch was upgraded to Xindian post office. ?

1943, Tieshan, Gu Wei and Shiqiao set up postal agencies, which were later changed to post offices to handle small remittance business. ?

From 65438 to 0945, Zhangdian and Nanding were both secondary and secondary post offices. Zhangdian Post Office 1 Director, 2 postal clerks, 3 messengers and 4 coolies. There are also postal agencies in the Great Wall and Ma Shang. ?

1March, 948, the whole territory of Zibo was liberated, and "Zhonghua Post Office" was taken over by the wartime post office. ?

…………………

Until today's network communication, e-mail.

The earliest envelope

Before the birth of envelopes, people were very nervous about the confidentiality of letters. In order to send a letter, the ancient Greeks shaved off the slave's hair, wrote a letter on his scalp, and sent the letter after the hair grew. The recipient can read the contents of the letter by shaving the slave's hair. BC 10 century, the Assyrians in Mesopotamia made writing paper out of clay tablets, carved the contents of letters, and then put them in pottery and burned them. The receiver must break the pottery to know the contents of the letter.

During the Spring and Autumn Period, Warring States Period, Qin and Han Dynasties in China, the common letters were wooden slips. Wooden slips are generally 1 foot long and about 0.33 meters long, so they are also called foot slips. The envelope is made of wood, carp-shaped, with one bottom and one cover sandwiched outside the letter. Carve three wire slots on the board, tie them with rope for three times, and then tie them through a square hole. Check the wood at the end or intersection of the line, seal it with mud, and stamp it as a letter of inspection to prevent unauthorized disassembly. This kind of wooden board can be regarded as the earliest envelope in the history of China.

After China wax was introduced into Europe, sealing paint became the magic weapon of communication secrecy. 1820, British bookseller Brewer found that many ladies and gentlemen were keen on writing letters, but they were afraid that the contents of the letters would be known, so they designed several envelopes. This is the first batch of paper commodity envelopes in the world. 1844, the first machine for pasting envelopes appeared in London. Since then, paper envelopes have become popular all over the world.

The postmark on the envelope

Now the main purpose of postmark is to stamp. However, postmarks appeared more than 400 years earlier than stamps. 1In the 1930s, the post office in Venice, Italy first used postmarks. At that time, it was just a small stamp on the mail, indicating the place name of the mail. Since then, there has been a postmark of postage paid, but there is no specific date.

16 1 year, Bishop, the director of the British General Post Office, created the world's first postmark with a date in order to check and assess whether the postman delivered the mail in time, which made the postmark perfect and has been used ever since. This postmark is earlier than the birth of the first stamp in the world 179.

1879, the Qing government in China opened a post office, using the gossip postmark. The gossip postmark only indicates the place name, not the date. Later, the postmark gradually marked the date. But the date on the postmark is quite special. After the founding of People's Republic of China (PRC), the unified adoption of the AD date.

After entering the 20th century, there are more and more kinds of postmarks, including datestamps, postage prepaid stamps, commemorative stamps, free military postmarks, and commemorative stamps of tourist attractions 10.

The earliest penny stamps

Before Bishop invented the datestamp in 1365, the Paris Post Office of France, inspired by the postmark, printed a special paper to deal with the increasing backlog of letters due to refusal to pay postage. There is no pattern on the paper, only words are printed. This small piece of paper with postage prepaid stamp is the earliest stamp.

Irish James chalmers printed the world's earliest stamps in 1834, which was implemented after the British postal secretary Sir rowland hill reformed the postal service in 1838. Hill stipulated that the national postage standard charged a penny for half an ounce and issued a penny stamp.

Punch holes in stamps

1847, Englishman Henry Arthur invented the first stamp cutting equipment. At first, this equipment could only cut stamps. A year later, the inventor improved the machine and made a punching machine that could punch a row of small holes. 1854, the first stamp punching machine was born.

postbox

Around 1650, there is a post office in Paris, which is responsible for communication and postal services with other provinces and foreign countries, but residents in Paris cannot communicate with each other. Therefore, in 1653, the Frenchman de Ville hung some boxes for putting letters on the wall at the corner of the street as mailboxes for the first time, which made up for this defect. As long as the residents living in the city stick the prepaid bill on the envelope, they can drop the letter into the nearby mailbox, and the post office staff will open the box three times a day to get the letter.

1692 Paris * * *, there are six such mailboxes, 1723 has seven, 1740 has 12, 1780 has increased to more than 500.

postcard

186 1 year, American John Charlton invented postcards in Philadelphia. Later, a businessman named Harry Lipman decorated the design of the postcard, published it and applied for a patent. Postcards with prepaid postage don't need to be stamped. This postcard was first invented by Emmanuel Herman of Ishtat Military Academy in Vienna, Austria. 1 869 65438+1October1,the world's first prepaid postcard with a light yellow surface and a stamp with a face value of 2 Cleather. Postcards can express greetings, congratulations, apologies, etc. For relatives and friends, this is irreplaceable by other means of communication. Therefore, they are still widely used today, with more and more kinds and more artistic decoration, which brings people a kind of beautiful enjoyment. Such as birthday cards, student cards, wedding cards and so on. Nowadays, postcards have become a part of people's lives.

Special colors of postal services

The special colors of postal services all over the world are set according to their own traditions and habits. For example, Britain uses red, the United States uses gray and China uses green.

After the founding of People's Republic of China (PRC), at the first national postal conference held in February 1949, the issue of special colors for postal services was discussed, and it was considered that green symbolizes peace, youth and prosperity, so a resolution was made to stipulate that people's postal services should adopt green as special colors.

How to send international mail?

There are about 654,000 post offices in the world, and the number of international mails reaches 654.38+0 billion every day. There are millions of postal workers in the 169 member countries of the World Postal Union serving the delivery work. So how is the international mail delivered? For example, a person who works in Pisriver, Alberta, Canada wrote a letter to a friend who lives near Nice in southern France on Monday. The postman collected the mail that afternoon and sent it to the post office in town. Postal personnel separate local mail from mail sent to other parts of Canada, and divide international mail into two categories: west of the Pacific Ocean and east of the Pacific Ocean. In the evening, the mail was loaded on a truck and transported to Prairie City, which is 160 km away. The next morning, two kinds of international mail were loaded on trucks, transported to Edmonton, the provincial capital, 480 kilometers away, and transported from Edmonton Post Office to the airport. At the airport, westbound mail is airlifted to Vancouver and eastbound mail is transported to Toronto. After the mail arrives in Toronto, it is classified according to the destination country. This process will not be completed until Thursday. On Thursday night, the international flight flew from Toronto to Paris and arrived on Friday morning.

In Paris, mail is handled by a mechanized system. The encoder adds a bar code according to the postal code to indicate the final delivery location of the letter. Another machine sorts letters one by one by administrative district. Letters are sent to pouches along the conveyor belt, and pouches are sent to Marseille and Nice by trucks, trains and planes. The postman in Nice sorts the letters and delivers them to the post office on Saturday morning. Then the postman delivers them to his friend's house.

Global express service

Ordinary mail service is not fast enough, because postal workers have to deal with hundreds of millions of mails, and the delivery speed is slow, and it takes days or even weeks for the mails to reach their destinations. At the end of 1960s, companies all over the world encountered the big problem of fast mail delivery, and international express delivery companies came into being. Commercial organizations send planes to all parts of the world, most of which can arrive within 24 hours. Air express service companies use the latest technology to reserve cargo flights and passenger seats so as to choose the quickest route at any time. Large express companies use computers to store flight schedules around the world. Many companies also have their own planes and helicopters. All express delivery companies have special fleets, equipped with vans and motorcycles, to receive and deliver mail from door to door.

The largest express delivery company in the United States, 1989, has 4 18 planes and handles140,000 mails every day on average. European courier companies can deliver the mail to other parts of Europe the next day and to places outside Europe within two days. American express companies can deliver mail to domestic destinations on the same day or the next day.

Express mail is mostly letters or small parcels, and more and more manufacturers use express service to transport finished products. In the 1970s, the total turnover of the express delivery industry doubled every two or three years, and the annual total value of 1990 reached about $4 billion.

Rocket express mail

An American company created it with ingenuity. Its equipment is simple and its cost is much lower than that of space rockets. It uses the warhead cabin of the rocket to transmit mail with a load of 10 kg. After the rocket arrives at its destination, the rocket door automatically opens, the mail is ejected by parachute, and then the local post office is notified by radio to receive the mail. The rocket passes through the atmosphere at high speed, and it takes only 50 minutes from new york to London. This company has now officially accepted postal services.

Electronic messenger

Electronic messenger is a kind of letter with specific specifications. After being put into the e-mail, the letter is automatically opened and scanned word by word by photoelectric equipment, and the optical signal is converted into an electrical signal. In this way, text and image information can be transmitted to far places by fax machine, and the original letter can be destroyed automatically. At the same time, the fax machine converts the received electrical signal into optical signal, records the sender's handwriting on the standard letter by photography, seals it automatically, and then outputs a letter with the same address, name and content as the sent letter. No matter how far apart, the electronic messenger can complete the whole transmission process in only a few tens of seconds.

1 June 7, 980, the first letter crossed the Atlantic Ocean from London by satellite and arrived in Toronto, Canada in a short time of1minute. After receiving the mail, the local post office delivers it to the recipient by express delivery.

Stamps will become the treasure of 2 1 century.

By the middle of 2 1 century, communication will no longer need any stamps, and the existing stamps will become a rare thing. A Belgian postal expert asserted that by 2040, to commemorate the 200th anniversary of the birth of stamps, it will complete its historical mission and retire to the museum. Because the computerized mail processing system will replace the postal service. When writing a letter, type the first draft on the computer typewriter and modify it on the screen. When satisfied, the letter will appear on the recipient's terminal computer as long as the code is input into the computer. In addition, with the popularization of advanced telephone system, people can talk to relatives and friends all over the world at any time without writing letters.

Morse sent the first telegram.

On May 24th, 1844, scientists and government officials watched Morse operate the telegraph alone in the meeting room of the Federal Supreme Court of the Capitol in Washington. With a series of dashes, Baltimore, 64 kilometers away, received the world's first telegram, which read: "I am trying to tear up Wei Quenajie". . This is the first official long-distance telegram sent by mankind.

Morse's invention opened a new page in the history of human communication. People realized for the first time that telegrams were useful. Of all the undertakings that use electricity to serve mankind, telegraph is the earliest application.

When the user's telegraph is connected to the computer network, the user can search for information and files at home and receive files from the telegraph without going to the library. Journalists can send articles to newspapers thousands of miles away in front of users' telegraphs, and businessmen can use it to negotiate business. Telegraph has been widely used abroad.

Early telephone calls

Because the structure of the calling end and the receiving end of the telephone is exactly the same, in the early days of the invention of the telephone, there was only one spool on the telephone, which was used for listening and speaking. Because the caller should put the microphone in his ear and speak immediately after listening to the other party's speech, and if he makes a mistake in his busy schedule, many people will joke that he speaks with his ear or obeys with his mouth.

Today's call

Today, the telephone is not what it used to be. At present, the microphone is composed of two parts, one is talking and the other is obedient, which is very convenient. The listener is equipped with a receiver and the speaker is equipped with a microphone.

Microphones are the parts that talk to each other on the phone. It is no longer composed of metal sheets and electromagnets like early telephones, because the induced current generated in that way is too small, and it is difficult to hear clearly when the call distance is long. The current microphone is mainly composed of a metal sheet and a small iron box filled with carbon particles, which is called carbon particle microphone. When talking into the microphone, sound waves push the metal foil to vibrate back and forth, giving different pressures to the carbon particles, so that the current changes with the sound. Using this principle, the microphone converts the change of voice into the change of current and transmits it on the wire.

The receiver is the part attached to the ear when making a phone call. Its structure is similar to that of early telephones, and it is still composed of electromagnets and metal sheets. The voice of the other party is converted into corresponding current through the microphone, which flows through the coil of the receiver, making the metal plate vibrate to form sound, thus achieving the purpose of talking between the two parties.

Bain invented the fax machine.

1843, Bain in England invented the earliest fax machine. Bain cut the metal plate into characters, put it on the insulation board, and then rubbed it with several metal claws, and the claws touched the characters or the insulation board. Bain connected a wire to each claw, and the other end of the wire was connected to the telegraph receiver, which was equipped with a pencil. When the claw contacts or separates from the metal part, this change is transmitted to the receiver through the wire like a telegraph signal, so the pencil at one end of the receiver draws a line on the paper. In this way, when a plurality of claws touch the metal characters at the same time, this change is transmitted to the receiver through the wire, and the pencil of the receiver touches the paper, and the paper moves according to the pressing speed of the claws, thus drawing the shape of the characters on the paper.

wireless paging system

When a person needs to make a phone call with a friend whose whereabouts are unknown, he can call the paging station to send a signal, which will be converted into a wireless signal and sent out throughout the city. After that, the pager that the callee carries will beep to let the callee know who is calling him and get in touch with the caller immediately.

The terminal equipment of wireless paging system is the receiver, that is, the BP machine, which can be pinned to the belt or put in the pocket. With the appearance of VLSI, BP machine can be made smaller and smaller. Generally speaking, the radio paging system is a paging system that is served by the post and telecommunications departments for the public. With large capacity, the structure mostly adopts single office and multi-station system, that is, a paging central office and several base stations are established in a broad service range, and these base stations are evenly dispersed in the service area to form a paging network. Each base station is controlled by the paging central office and sends out the same signal at the same time. At the same time, the paging central office is in direct contact with the local telephone office. In this way, people can call the users of the BP machine by local telephone, and the users of the BP machine can receive the call signal from the radio waves sent by the nearest base station.

Handheld mobile phone

Walkman is a small wireless phone with battery as power supply, and the initial product can be carried with you. This was successfully developed in World War II for soldiers to use for short-distance communication in combat. Large wireless phones can be installed on tanks, military trucks and other vehicles. After the war, wireless phones were improved, and mobile communication machines were often used in patrol cars, ambulances, fire command vehicles and harbor fire boats.

The mobile radiotelephone was developed in the United States in the 1970s. Public security, aviation, shipping, transportation, industrial and commercial enterprises, local governments and other departments not only use mobile phones as a means of communication, but also as a management tool. 90% of the mobile wireless phones used in the United States are intercom phones. Both parties who use intercom phones make single-frequency or dual-frequency simplex contact group calls on designated channels, and all frequency bands are used. VHF or UHF is used for short-distance transmission, and medium wave, short wave or satellite microwave is used for long-distance transmission. At present, selective calling and quasi-duplex systems have been developed, which use voice-initiated transmission instead of buttons. No center * * * uses channel network to improve this, which can not only dial the call, but also make full use of the idle time of the channel and save the channel. The method is to specify the channel as mutual contact, select the channel as call, and automatically recover after use.

Electronic computers appeared.

Before the birth of electronic computers, there were mechanical computers. 1642, Pascal of France made the earliest decimal adder. 1673, Leibniz of Germany invented the hand-cranked computer and put forward the binary operation method. Babbage of Britain designed the difference machine and analyzer in 1822 and 1834 respectively, and realized the automation of the calculation process with punched cards. 194 1 year, Giuseppe of Germany successfully developed the world's first universal automatic electronic computer stack with binary program controlled by electromagnetic relay. Tina Cheng? In 944, Aiken of America made the last mechanical computer Mark- 1, which is the predecessor of all-electronic computer.

Computers have laid the foundation for the information society.

Computer can simulate and replace some thinking functions of human brain, expand human information processing ability, improve data storage and use efficiency, and realize the enjoyment of information resources. Computer has penetrated into all fields of human life, causing great changes in the whole human society and becoming an epoch-making information revolution. The wide application of computers has created conditions for the transition from industrialized society to information society.

Wonderful multimedia technology

In the past, personal computers could only handle words and numbers, that is, a single medium. Nowadays, personal computers can handle not only words and numbers, but also images, texts, audio, video and other media, which is multimedia. Multimedia integrates technologies such as computer, television, video recorder, tape recorder and game machine, forming an operating environment where computers and users can communicate with each other. Man-machine interaction is the biggest feature of multimedia. You can only watch TV and movies, but in multimedia, you can modify graphics and colors. You can participate in it, change the plot and ask the actors to perform according to your wishes.

Multimedia technology combines computer technology, audio-visual technology and communication technology, and adopts advanced digital recording and transmission methods, which can replace all kinds of household appliances at present, so it will spread all over people's lives.

What can multimedia do?

Multimedia technology makes communication more convenient. People can use multimedia to talk with relatives, friends and customers anywhere in the world at any time. Speakers can not only hear their voices and see their faces, but also save their images. People don't have to buy televisions, video recorders, personal computers, telephones, tape recorders and other household appliances, but only a multimedia computer can include all these functions. It also has the function of an audio-visual library, and people can read all kinds of electronic magazines with pictures, sounds and articles without leaving home. Multimedia technology can also diversify teaching, provide a lot of teaching resources for teachers and students, and provide more convenient scientific research tools for scientists. Computer aided design is more intuitive, and people can use it to draw more beautiful pictures and compose more beautiful music.

information superhighway

Internet is an international network that connects many networks together, and it is the highest level backbone network. It is connected with LAN, LAN is connected with WAN, WAN is connected with LAN, and many computers are connected with LAN. In this way, multiple computers are connected together, realizing resource sharing.

The Internet has many uses. It can be used to send e-mails, meeting notices or briefings to Internet users all over the world, hold electronic meetings of relevant personnel scattered around the world, and establish e-mails. News released on the Internet can spread quickly around the world. Researchers can quickly exchange papers, reports and computer source programs. Users can retrieve information distributed on different networks freely and at high speed. Users can also log in remotely and use software and hardware resources connected to the Internet, such as using supercomputers. You can also use various business data services by logging in remotely.