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There was a time when keywords were very important in web sites promotion and ranking. The way search engines spiders considered the content of a page for ranking and appropriate search matching, was strictly related to keywords. But then, many webmasters thought that filling up long lists of not so much related keywords to their pages, helped them to get a higher ranking. When I say "not so much related", I mean that sometimes a good and sexy word could really draw traffic. Webmasters used to look for popular keywords and add them to their pages, regardless that they were consistent or not with the content of the page itself. And so, starting from 1999, search engines have gradually stopped looking for them and stopped considering them. At least most of them (it actually seems that Yahoo is still using them in conjunction with the real page content).