A summary of search engines

What is a search engine?

A search engine collects and sorts information resources on the Internet and then provides the system for you to query. It consists of information collection, information sorting, and user query.

The search engine is actually a website, but it specifically provides information "retrieval" services for you.ProgramClassify all information on the Internet to help people find the information they need in the vast ocean of information.

Search engines are divided into two types according to their working methods: one is classified directory-based retrieval, which collects Internet resources and divides them into different directories based on the types of resources they provide, further, people need to find the information they want. They can enter the information they want by their classification, so that they can finally reach the destination and find the information they want. The other is keyword-based retrieval, in this way, users can enter various keywords (keyword) in a logical combination. The search engine computer searches for the addresses of resources required by users based on these keywords, then, according to certain rules, all the URLs containing the keyword information and links pointing to these URLs are fed back to the user. As Internet information grows in a geometric manner, these search engines use a program called spide to automatically search for the beginning of each page of a website, put all words representing hyperlink on each page into a database for users to query.

Seo principles:
(1) meet the crawling habits of the search crawler as much as possible.
(2) try to satisfy the frequency of keyword appearing on the permission location.
(3) Update as frequently as possible.
(4) Try not to use Ajax technology.
(5)give full detail to the robots.txt write.

Importance of search results:
(1) fast search.
(2) The search result is what the user wants.
(3) advertisements are also matched.