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1. Crawling the Web
Search engines run automated programs, called "bots" or "spiders", which use the hyperlink structure of the web to "crawl" the pages and documents that make up the World Wide Web.

2. Indexing Documents
Once a page has been crawled, its contents can be stored in search engine's database which is called "indexing". This index contains all the pages that have been crawled by bots and spiders and needs to be properly managed so that when a request is made search and sort billions of documents can be completed in fractions of a second.

3. Processing Queries
After indexing search engine process the query. Query is the keyword or keyword phrase which you type when searching for a particular thing. When you request for a information, search engine retrieves all the documents and pages from its index that match your query.

4 Ranking Results
After determining which documents and pages match your criteria, search engine performs its next step and ranks the search result so that you can find which is most relevant to you. For this purpose, search engines run a sorting equation which is called an algorithm. Different search engines have the different algorithms to rank the best results for you. Then the search engine present you ranked results that are most relevant to you so that you can choose from them.

Thus search engines perform these for steps to search for an item you have requested. Search engines like Google, MSN, and Yahoo are more popular these days and they are among the most complex systems.

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