A program that looks through documents for specific keywords and then provides a list of the ones that contain those words is known as a search engine. Even though a search engine refers to a broad group of programs, the term is frequently used to describe methods allowing users to locate documents on the Internet.



When using this search term regarding the Internet, it is usually in reference to the actual forms that perform the search of the HTML document database that were originally compiled by a robot. There are three basic types of search engines: There are robot powered submissions, human based submissions, and some that are a combination of the two.

Search engines that use automated software agents termed as crawlers are known as crawler-based search engines. The crawlers visit the web site, read the information including the site's meta tags and traces the links that the site attaches to performing indexing on all linked Web sites

The crawler returns all that information back to a central or main depository, where the data is indexed. The crawler will periodically return to the sites to verify for any information that has changed. The frequency with which this happens is determined by the administrators of the engine.

There are also search engines powered by human intelligence that depend on the information that people contribute and it later gets indexed. Only data that is presented is entered into the index. In both scenarios, when you ask a search engine to find information, you're really looking through the index which has been created by the search engine.

That means you are not actually searching the Internet. These are huge databases of information that is collected and stored and subsequently searched. This explains why sometimes a search on a commercial search engine, usually will return results that are, in fact, dead links. Since the search results are based on the index, if the index hasn't been updated since a Web page became worthless the search engine treats the page as still an active link even though it no longer is good. It will remain this way until the index is updated.

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