Nowadays, there is an urgent need for a frequently visited website . To do this, the site ought to be effective in attracting users and efficient to deploy the content they seek. The Web, besides being the source of the world’s largest global, can be seen as:

• An advertising medium with global reach
• A sales channel for most companies (e-commerce)
• A platform for content distribution (e-media)
• A meeting place for buyers and sellers through online marketplaces (e-market)

Hence the economic importance of having a high and frequently visited site. To achieve this, there are several alternatives ranging from methodologies to increasethe ranking of a site in the most used search engines (Google, Yahoo!, Bing, etc..) to complex data mining techniques that deliver patterns that will provide knowledge to improve the structure and content of the site based on user behavior.