SEO - Search Engine Optimization
SEO is in short terms to work on getting a particular site to emerge on the best possible organic placement (organic ranking) in search engines, such as eg. Google, Bing, Yahoo etc.
IIn Google's case, the organic list it as seen in the left side of the screen (excluding any top results at the top marked with a background color and text "sponsored links").
The right side of the screen on Google shows several sponsored links, such placement can be bought and are known as Google Adwords.
At IntraMedia, we continuously develop on our website design and CMS solutions, to offer the best possible technical conditions for a proper search engine optimization and good rankings in search engines.
You can read much about
SEO at Wikipedia 's article on the subject.