The true definition of Search Engine Optimization (SEO) can be stated as a highly specialized process of building a successful website. We say successful because if a commercial website cannot be found in the major search engines, it is not successful, it just isn't doing it's job.
Short for search engine optimization, the process of increasing the amount of visitors to a Web site by ranking high in the search results of a search engine. The higher a Web site ranks in the results of a search, the greater the chance that that site will be visited by a user. It is common practice for Internet users to not click through pages and pages of search results, so where a site ranks in a search is essential for directing more traffic toward the site.
SEO helps to ensure that a site is accessible to a search engine and improves the chances that the site will be found by the search engine.