Search Engine Optimization

Search Engine Optimization (SEO) is the process of improving the volume or quality of traffic to a web site or a web page (such as a blog) from Search Engines via "natural" or un-paid ("organic" or "algorithmic") search results as opposed to Search Engine Marketing (SEM) which deals with paid inclusion. The theory is that the earlier (or higher) a site appears in the search results list, the more visitors it will receive from the search engine. SEO may target different kinds of search, including image search, local search, video search and industry-specific vertical search engines. This gives a web site web presence.
As an Internet marketing strategy, SEO considers how search engines work and what people search for. Optimizing a web site primarily involves editing its content and HTML and associated coding to both increase its relevance to specific keywords and to remove barriers to the indexing activities of search engines.
Because effective SEO may require changes to the HTML source code of a site, SEO tactics may be incorporated into web site development and design. The term "search engine friendly" may be used to describe website designs, menus, content management systems, images, videos, shopping carts, and other elements that have been optimized for the purpose of search engine exposure. (Source: Wikipedia).