[satendra]

Search engine optimization is a methodology of strategies, techniques and tactics used to increase the visitors to a website by obtaining a high-ranking placement in the search results page of a search engine -- including Google, Bing, Yahoo and other search engines.  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.

[thomaswhite544]

Search engine optimization (SEO) is the process of affecting the visibility of a website or a web page in a search engine's unpaid results—often referred to as "natural," "organic," or "earned" results.