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An additional important factor to remember about search engines is that they don’t use real individuals to crawl the billions of websites and judge how relevant they are. Instead they use automated software known as a “spider” or a “bot” that does this work significantly quicker. The calculations that the search engine uses to decide the ranking of a web site are called algorithms and in the case of the main search engines like Google dunk heels , Yahoo and MSN these algorithms are changed on a regular basis. The changes and also the specifics of the algorithms aren’t released to the public in order to stop black hat SEOs from manipulating their internet sites to reach the top of the pile despite containing to details relevant to the search query or keyword.