The basic working principle of search engine

To do a good job of SEO, you need to first SEO operation Object-Search engine work principle to understand, the following is to say the general working principle of search engine:

The basic working principle of search engine includes the following three processes:

First of all, find and collect web information in the Internet, at the same time to extract the information and organize the index library, and then by the http://www.aliyun.com/zixun/aggregation/18678.html "> user input query keyword, Quickly check out the document in the Index library, conduct the correlation evaluation between the document and the query, sort the results that will be output, and return the query results to the user.

1, crawl Web page

Each independent search engine has its own web crawler (spider). Spider continues to crawl the Web page along the hyperlinks in the Web page. The crawled Web page is called a snapshot of the web. Because the use of hyperlinks in the Internet is very common, theoretically, from a certain range of Web pages, you can collect the vast majority of web pages.

2, processing Web pages

Search engine caught the page, but also to do a lot of preprocessing work to provide retrieval services. Among them, the most important is to extract keywords, set up index library and index. Others include removing duplicate pages, segmenting (Chinese), judging the type of Web pages, analyzing hyperlinks, and calculating the importance/richness of web pages.

3. Provide search service

User input keywords to search, search engine from the index database to find a match to the keyword page; for the convenience of the user, in addition to the page title and URL, will also provide a section from the Web page summary and other information.

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