Wednesday, October 17, 2012

How Do Search Engines Work?

Search engines usage has grown hugely; everyone started using search engines to know the information about their needs, in our daily life we are using search engines through desktop pc’s, laptops, tablet pc’s, mobile devices and etc..,
Search engines operates in three major functions
1. Crawling
2. Indexing
3. Searching
Internet Search Engine works on storing hundreds of millions WebPages information which are available in the internet, A web crawler (also called as spider) is a software program that browses the World Wide Web (www) in automated manner, Web crawler reads the WebPages and jumps in to the another WebPages through the links present in the WebPages in this way it can reach millions of interconnected WebPages. The crawler reads the webpage from the top left to the bottom right, it reads the title of the web page, Meta description, keywords and data present in the webpage, it saves the selected data in index database for use in later queries.
The reason why indexing exist is to deliver the answers for users questions as soon as it found, search engines like Google stores the complete or part of the source page ( referred as a cache) along with the information about the pages and other search engines like Alta vista stores every word of the web page whatever they find.
If a user enters query into search engine, the engine checks its index and provides best match results according to its priority, the results contains the short summary of page title, some parts of the texts and the URL (Uniform Resource Locator). The search results of query come according to its indexing data.
Many Search engines work on this process to give best results to the users without disappointing them.
Checkout “How Search works” video by Google Matt Cutts at

This Article How Do Search Engine Work copied from