How Search Engine Works

How a Search Engine work?

A spider or crawler which is a component of a SE (Search Engine) gathers listings by automatically "crawling" the web

The spider follows links to web pages, makes copies of the pages and stores them in the SE’s index

Based on this data, the SE then indexes the pages and ranks the websites

Major SEs that index pages using spiders: Google, Altavista, Msn, Aol

In brief Search engines use "spiders" to scan the Web for sites, logging certain information and storing that information on servers for later access (this is called indexing). When a user types a search term into the search engine, that search engine pulls up all the sites in that index that contain the term(s). Site with users in mind, so your content has to be relevant, meaningful, and useful to the person visiting your site.