Search engine optimization (SEO) is the process of affecting the online visibility of a web site or a web page in a web search engine’s unpaid results—often referred to as "natural", “organic” or "earned" resultsSearch engine optimization (SEO) is the process of affecting the online visibility of a web site or a web page in a web search engine’s unpaid results—often referred to as "natural", “organic” or "earned" results. In general, the earlier (or higher ranked on the search results page), and more frequently a website appears in the search results list, the more visitors it will receive from the search engine's users; these visitors can then be converted into customers.[1] SEO may target different kinds of search, including image search video search, academic search news search, and industry-specific vertical search engines