I come across this SEO article at webproguide.com. This is worth to share here.

Search engines Ranking is what SEO is all about. You tweak your pages trying to “meet search engine’s requirements” and gain high ranking in the search engines’ results. However, what are these “requirements”? We all know search engines are nothing but robots, computers that follow a certain program to determine which site is more relevant to a query and which one is less useful. Yes, when chasing search engines ranking, we are just struggling against a machine

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