Search engines have two major functions: crawling and building an index, and providing search users with a ranked list of the websites they've determined are the most relevant. Imagine the World Wide Web as a network of stops in a big city subway system. Each stop is a unique document (usually a web page, but sometimes a PDF , JPG, or other file). The search engines need a way to “crawl” the entire city and find all the stops along the way, so they use the best path available —links. The link structure of the web serves to bind all of the pages together. Links allow the search engines' automated robots, called "crawlers" or "spiders " to reach the many billions of interconnected documents on the web. Once the engines find these pages, they decipher the code from them and store selected pieces in massive databases, to be recalled later when needed for a search query. To accomplish the monumental task of holding billions of pa...
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