What is a vertical search engine?

Vertical search is a professional search engine for a certain industry. It is the subdivision and extension of search engine. It is the integration of some special information in the web page library, which extracts the required data through the direction field, processes it, and then returns it to the user in some form.

The biggest difference between vertical search engine and ordinary web search engine is that it extracts structured information from web information, that is, it extracts unstructured data of web pages into concrete structured information data, just as web pages are the smallest unit in web search, web page block analysis based on vision is the smallest unit, and vertical search is the smallest unit in structured data. These data are then stored in a database for further processing, such as deduplication, classification, etc. Finally, word segmentation and indexing can meet the needs of users through search.

In the whole process, data is extracted from unstructured data into structured data, and returned to users in an unstructured and structured way after deep processing.

Vertical search engines have many applications, such as enterprise database search, supply and demand information search engine, shopping search, real estate search, talent search, map search, mp3 search, picture search, etc ... Almost all kinds of information from all walks of life can be further refined into various vertical search engines.

For example, it will be easier to understand. For example, the overall process of a shopping search engine is roughly as follows: after grabbing a web page, extract the product information of the web page, extract the product name, price, introduction ... and even further subdivide the notebook introduction into "brand, model, CPU, memory, hard disk, display screen, ..." and then clean, copy, classify, analyze and compare, data mine and mine the information.

Vertical search engines generally require the following technologies.

1. Spider; Spider-like objects; Star wheel; Cross; Connecting handle; crosshead

2.Web structured information extraction technology or metadata collection technology.

3. Word segmentation and indexing

4. Other information processing technologies

The technical evaluation of vertical search engines should be judged from the following points.

1. Comprehensive

Step 2 update

3. Accuracy (sex)

4. Function

Vertical search has a low entry threshold, but a high competition threshold. Without professionalism and superb technology, it is impossible. Industry portal has industry advantages, but it has no technical advantages. Don't imagine that all the techniques of vertical search can be done by recruiting a few people. As a product that needs continuous improvement and operation, rather than a project, the mastery of technology is one of the important factors for the success of vertical search.