Comprehending How Search Engines Work: An Infographic
Like the name suggests and Webopedia puts it, search engines are “programs that search documents for specified keywords and returns a list of the documents where the keywords were found off the World Wide Web.” It’s a class of programs at large, but they are often used for engines like Google, Bing and Yahoo!
They have two chief functionalities, to crawl the web and index and secondly to provide results of searches made according to the keywords fed in. Too heavy & confusing? Here’s an infographic that shows how search engines essentially function.