The difference between common search engines

We usually use search engines. Do you know the difference between these commonly used ones? Come and have a look with me.

The difference between common search engines

1, Altavista

Altavista is a search engine with the widest collection, the largest database capacity and the most powerful query function on the Internet. It provides directory query and keyword query. Keyword retrieval can be divided into simple retrieval and advanced retrieval. Through advanced retrieval, you can complete extremely complex queries. It supports commonly used Boolean operators, nesting, approximate search and so on. In addition, you can limit the search scope and language. Query results can also be translated in many ways, and a keyword list can be automatically generated according to the user's query results, so that users can choose their own keywords and improve the accuracy of the query.

2. Excitement

Excite is a search engine that can quickly retrieve concepts in a large database, and supports directory retrieval and keyword retrieval. Excite uses intelligent concept extraction technology when dealing with keywords. Therefore, when querying, it can not only retrieve the web pages that directly contain keywords, but also retrieve the web pages that do not contain your keywords, and also retrieve other words related to these keywords. In the display of search results, three kinds of results will be given: the website directory selected by experts, the result page and news reports. In advanced retrieval, you can have various search options and provide some special topics.

3. Hot robot

The most striking feature of HotBot is its powerful retrieval function. You can define complex queries by yourself through its drop-down menu. In the advanced query, in addition to providing selection boxes for restrictive conditions such as lexical collocation, language, time, number of results and content of results, more selection boxes are provided to further limit and optimize the retrieval conditions. With this, you can achieve a more accurate query. An important feature of HotBot is that it can not only index the vocabulary, but also search multiple characteristics of network resources, so that you can accurately retrieve specific resources.

4. Information search

Infoseek provides search for World Wide Web sites, news reports, company information and newsgroups, and supports directory search and keyword search. When using keyword search, you can enter paragraphs expressed in natural language as search requirements. In advanced search, it provides multiple selection boxes for you to enter various search restrictions or options. Infoseek's search results are divided into two parts: World Wide Web site theme directory and results page, which is convenient for users to find different information needs. In addition, Infoseek also provides several forms of modifying or optimizing retrieval, thus improving the accuracy of retrieval.

5、Lycos

As far as the number of indexed web pages is concerned, Lycos is a medium-sized search engine, but Lycos is not limited to the search engine function, but tries to build a portal website to guide users to other websites. Can this be stewed in storks? Take advantage of Mei Street in Ma Xie? What's your name? Pan ⅲ? Is health difficult? Crazy? What's your date? Hey? Did the car get scratched? Are you talking about school? Solid? There are three sorting methods for you to display search results.

6. Yahoo

Yahoo is rich in content, including directory retrieval, keyword retrieval and thematic retrieval. In Yahoo's retrieval method, you can choose to search in four databases: category, webpage, current file index and latest news, and you can also use various Boolean operators. In advanced retrieval, you can define various intelligent search methods to improve the hit rate. If Yahoo cannot retrieve the user's keyword, it will not automatically transmit the query to Altavista, and alta vista will further query the user.

Characteristics of Google and Baidu

Features of Google

Google adheres to development? Understand the meaning of users and return to their needs? what's up Perfect search engine? , which makes the search method fundamentally changed and unique in the industry. Its powerful functions and unique features are:

( 1) ? Web page snapshot? Function. You can retrieve cached web pages directly from google server. If the original address is opened slowly, you can directly view the Google cache page, because the Google server is extremely fast; If the original link is dead or temporarily blocked due to network reasons, you can see the page information through google Snapshot; If the information on the opened page is huge and you can't find the location of keywords at once, you can take a Google snapshot, because Google marks the location of keywords in yellow in the snapshot.

(2) ? English explanation of words? Function. When writing English articles, the biggest headache is the uncertainty of the usage of an English word. Now with Google, everything will be solved! Whether you want to find the meaning of a new word or know the usage of a word, you can use an online dictionary.

(3) ? Web translation? Function. Google provides online translation function. Although only limited Latin, French, Spanish, German and Portuguese are supported at present, I have to admit that this is an excellent function, as long as you click? Translate this page? Button, Google provides you with machine translation of artificial intelligence, and the translated results make you understand roughly.

(4) ? Search results filtering? Function. There is a huge amount of adult information on the internet, and many websites have deceptive or other bad intentions, which makes it easy for visitors to fall into the trap. For this reason, Google has set up a new adult content filtering function, see Google's settings page, but this function is not available in Chinese.

(5) ? Hypertext matching analysis? Function. Google's search engine also analyzes web content.

It does not simply scan the text based on the webpage, but analyzes the overall content, font, partition and the exact location of each text of the webpage, and also analyzes the contents of adjacent webpages to ensure that the most relevant results are returned.

(6) ? PageRank，？ Technology. By calculating an equation consisting of more than 50 million variables and 2 billion words, PageRank can objectively evaluate the importance of a webpage. Instead of counting the number of direct links, it interprets the link from page A to page B as a vote for page B, which will evaluate the importance of the page according to the number of votes received by page B and provide highly accurate search results.

(7)? Image search? Function. Google can retrieve 390000000 pictures. The best image search tool on the Internet? For users in China, Google's image search engine is the best image search tool.

(8)? Newsgroup search? Function. Newsgroups have detailed classified topics, some of which are managed and edited by special personnel, which contain a lot of valuable information. Because newsgroups contain a huge amount of information, it is impossible to search without tools. In 200 1 year, google acquired DEJA and provided all the functions of DEJA. Now, in addition to search, Google also supports the web browsing and publishing functions of newsgroups.

(9)? Directory retrieval? Function, if you don't want to search a wide range of web pages, but want to find some special websites, you can visit google's classified directory. Classified website directories are generally handled by special personnel, with clear classification and centralized information.

(10) Other functions. Other functions of google include phone numbers, PDF files, stock quotes, who links with you, websites, dictionaries and so on.

The characteristics of Baidu

Baidu is committed to listening, exploring and meeting the needs of netizens in China. User experience first? In addition to web search, it also provides diversified search services such as MP3, documents, maps, love, movies, etc., and integrates the wisdom of countless netizens into the search, making? Baidu? It has become a new verb for people to search. Its unique functions and characteristics are:

( 1)? Baidu snapshot? Function. If you can't open a search result, or the opening speed is particularly slow, Baidu snapshot? Can help you solve it. Every included web page has a backup of plain text on Baidu, called? Baidu snapshot? . Because Baidu is faster, you can pass? Snapshot? Quickly browse the content of the page.

(2)? Related search? Function. The search results are not good, sometimes because the selected query words are inappropriate. You can get some inspiration by referring to other people's practices. Baidu? Related search? , is a series of query words very similar to your search.

(3)? Pinyin tips? Function. If you only know the pronunciation of a word, but don't know how to write it, or find it troublesome to spell a word, then the prompt of Baidu Pinyin can help you solve it. As long as you enter the pinyin of the query word, Baidu can prompt the corresponding Chinese characters that meet the requirements best. It is actually a very powerful pinyin input method.

(4)? A typo hint? Function. Due to the limitation of Chinese character input method, some typos are often input in search, which leads to poor search results. This is Baidu's prompt to correct typos. An input error prompt will be displayed above the search results.

(5)? English-Chinese translation dictionary? Function. Baidu online English-Chinese translation dictionary, just enter an English word or a Chinese word, and click the results page? A dictionary? Links can get high-quality translation results. Baidu online dictionary can not only translate ordinary English words, phrases and Chinese characters, but also translate common idioms, with the function of English-Chinese translation.

(6)? Calculator and measurement conversion? Function. The calculator function embedded in Baidu web search can solve your computing needs quickly and efficiently. You just need to enter the calculation formula in the search box, and then press Enter to see the result of the calculation formula. In Baidu's search box, you can also convert weights and measures. When you enter: converted quantity before conversion unit =? After conversion, press Enter to get the conversion result.

(7)? Professional document search? Function. Baidu has good office documents, Adobe PDF documents and RTF documents for full-text search. Just add one after the ordinary query word? File type? And document type. You can quickly view the contents of a document in web format. You can also use the professional document search function directly through Baidu document search interface.

(8)? Stock, train schedule and flight inquiry? Function. Enter the stock code, train number or flight number in the Baidu search box to get relevant information directly. For example, enter the stock code? 60000 1? At the top of the search results, the real-time stock market of Hangang is displayed.

(9)? Weather query? Function. Baidu can check the weather forecast at any time. As long as you enter the name of the city you want to query and add the word weather in Baidu search box, you can get the weather situation of the city that day. Baidu supports weather inquiries in more than 400 cities across the country and nearly 100 famous foreign cities.

( 10)? Hyperchain analysis? Technology. Baidu combines the citation index technology in traditional information science with the most basic link technology in the web, and evaluates the quality of linked websites by analyzing the number of linked websites, so that the more popular content ranks higher in Baidu search.

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