SEO stands for Search Engine Optimization. It is the process of getting traffic from the free, organic, editorial, or natural search results on the search engines. Simply put, it’s the name given to the activity that attempts to improve search engine rankings. In many respects, it's simply quality control for websites.
SEO may target different kinds of search, including image search, local search, video search, and news search engines. Employing a sound SEO strategy will help you position your website properly to be found at the most critical points in the buying process or when people need your site.
The leading search engines, such as Google, Bing and Yahoo!, use crawlers to find the pages for their algorithmic search results. Pages that are linked from other search engine indexed pages do not need to be submitted because they are found automatically.