Search engine optimzation also known as SEO is the process of improving a sites ranking in search engines like google, yahoo, msn etc. Main objective is to optimize website according to search engine algortihms and making them rank higher mainly in top 10 results.

In a broad sense, SEO is marketing by understanding how search algorithm work and what human visitors might search for, to help match those visitors with sites offering what they are interested in finding. Creating web pages with SEO in mind does not necessarily mean creating content more favorable to algorithms than human visitors.

Search engines responded by developing more complex ranking algorithm, taking into account additional factors including:

• Text within the title element
• Domain Name
• URL directories and file names
• HTML: headings, emphasized (<em>) and strongly emphasized (<strong>) text
• On page keyword proximity
• On page keyword adjacency
• On page keyword sequence
• Alt attributes for images
• Text within NOFRAMES tags
• Sitemaps