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On the Internet, a search engine is a coordinated set of programs that includes: A spider (also called a "crawler" or a "bot") that goes to every page or representative pages on every Web site that wants to be searchable and reads it, using hypertext links on each page to discover and read a site's other pages, a program that creates a huge index (sometimes called a "catalog") from the pages that have been read, and a program that receives your search request, compares it to the entries in the index, and returns results to you.