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A search engine is a program which combs through text sources for particular buzzwords and then makes a ranked listing of the results available. While search engines actually constitute an entire subgroup of software applications, that term is frequently utilized to indicate those programs which make it possible for users to look for 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 are crawler-based are ones that generally make use of automatic software agents known as crawlers that go to web sites, read the data on the site, read the Meta tags and follow the links connected to the site in order to index every site that links to it.

The crawler sends back all the data to a centralized reserve where the information gets indexed. The crawler goes back to the sites from time to time in order to confirm if any information has changed. The occurrence of this is established by those who administer the search engine.

Then there are the human-powered search engines that rely on humans to submit information that is subsequently indexed. Only information that is put forward is put into the index. In both these cases, when you query a search engine to locate information, you're actually searching through the index that the search engine has created.

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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