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1 If it's impossible to examine all the documents on the Web, how do the search engines do it?
  They use software programs known as robots, spiders or crawlers.  A      robot is a piece of software that automatically follows hyperlinks from one document to      the next around the Web.  When a robot discovers a new site, it sends information      back to its main site to be indexed. Because Web documents are one of the least static      forms of publishing (i.e., they change a lot), robots also update previously catalogued      sites.  How quickly and comprehensively they carry out these tasks varies from one      search engine to the next.
They use software programs known as robots, spiders or crawlers.  A robot is a piece of software that automatically follows hyperlinks from one document to the next around the Web.  When a robot discovers a new site, it sends information back to its main site to be indexed. Because Web documents are one of the least static forms of publishing (i.e., they change a lot), robots also update previously catalogued sites.  How quickly and comprehensively they carry out these tasks varies from one search engine to the next.
 
2 How Do Search Engines Work, Technologically?
  Click here for our detailed explanation of search engine technology, including keywords, clustering, relevancy ranking, meta tags and more. For a more highly technical discussion, try our page on Search Engine Ranking AlgorithmsFor the same reason you need a card catalogue in a library.  There is lots of great and useful information in a library, but it's physically impossible to examine all the books personally.  Not even the most indefatigable web-surfer could hyperlink to all the documents in the aptly named World Wide Web.  There are billions of pages on the Web.  And every minute of the day, folks are posting more.The search engines and directories help you sift through all those 1's and 0's to find the specific information you need.

 
3 Why do I need a search engine?
  For the same reason you need a card catalogue in a library. There is lots of great and useful information in a library, but it's physically impossible to  examine all the books personally.  Not even the most indefatigable web-surfer could  hyperlink to all the documents in the aptly named World Wide Web.  There are billions  of pages on the Web. And every minute of the day, folks are posting more.

The search engines and directories help you sift through all those 1's and 0's to find the specific information you need.
 
 


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