The search engine “spider” is an intelligent robot program that sends instructions to collect web page information on the Internet according to certain rules. Each search engine will have a set of spider program system, which simulates the way of manual access to the website, evaluates and reviews the website, and if it is high-quality content, it will be included and put in the index library, waiting for users to search and call it out. Finally, sort according to certain rules.
So, how do search engine spiders work? Only by understanding the principle of spider crawling, Website SEO optimization can achieve twice the result with half the effort.
How do search engine spiders work?
There are many kinds of spider programs, such as: ordinary crawlers, focused crawlers, incremental crawlers, deepweb crawlers, picture spiders, video spiders, advertising spiders, promotion spiders, etc.!
The tasks performed by each spider program are also limited to their corresponding fields, and a division of labor and cooperation mode is adopted to crawl website resources. The working principles of various spider programs are roughly the same, and can be divided into the following four steps!
1: Crawl the web
The spider starts from the index area to grab the web page links on the network. Initially, the spider grabs the links of the whole web, without pertinence and purpose.
2: Filter (include)
The spider puts the crawled web pages into the index database for screening and filtering, indexes the content that conforms to the algorithm and rules, and eliminates the content that does not conform to it, and stores some internal skills for secondary screening and filtering, so that Continuously cycle.
3: Index
Many webmasters will find that websites and indexes are not equal, and some novice webmasters think that indexing is equal to indexing.
In fact, it is not the case. Generally speaking, the website collection is greater than the index. Because only the included articles are eligible to be indexed, the recommended articles captured by the search engine will be indexed.
4: Ranking Display
This is the ultimate goal of SEO, and it is also the last step in the process of crawling webpages by spiders. Articles in the index area will be classified, archived, and sorted by search engines in a unified manner, and then the content will be fed back to search users.
What SEOer has to do is to index the articles recommended to users by search engine algorithms to a relatively good position, so as to realize our traffic conversion and reflect the value of SEO.
