Search engine optimization(SEO) is the process of improving the volume and quality of traffic to a web site from search engines via "natural" ("organic" or "algorithmic") search results.Usually,the earlier a site is presented in the search results,or the higher it "ranks," the more searchers will visit that site.SEO can also target different kinds of search,including image search,local search, and industry-specific vertical search engines.

As an Internet marketing strategy, SEO considers how search engines work and what people search for.Optimizing a website primarily involves editing its content and HTML coding to both increase its relevance to specific keywords and to remove barriers to the indexing activities of search engines.