Search engine optimization (SEO) is the process of improving the volume or quality of traffic to a web site from many search engines. In other way you can say that the process of getting your website to the top of the search engines is known as search engine optimization (“Organic” or “algorithmic”) search results as opposed to search engine marketing (SEM) which deals with paid services. Typically, 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, and industry-specific vertical search engines. This gives a web site web presence.
SEO considers how search engines work and what people search for. Optimizing a website 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.
Other to search engine optimization Internet marketing. search-friendly web design, pay-per-click (PPC) advertising campaigns, link building programs, social media optimization, blog optimization and marketing, targeted local search marketing, and mobile marketing optimization.
Another class of techniques, known as black hat SEO or Spamdexing, use methods such as link farms, keyword stuffing and article spinning that degrade both the relevance of search results and the user-experience of search engines. Search engines look for sites that employ these techniques in order to remove them from their indices.