Some history: An interesting concept started in the 1990 it was the search engine when the firts seach facility that was created by a university student. A few years later, the first search engines started working, two of them where the pioniers Yahoo and Lycos It was that time that a few companies started experimentig techniques with the concept of search engine optimization, called seach engine marketing. Search engines modified their ranking algorithms , but web site seach engine optimisers discovered new techniques to respond to these changes, resulting in the development of a "cat and mouse" relationship between the search engines and the SEO industry. For who you make the tifo the Cat Or the Mouse?