Search engine optimazation (SEO) is that the method of accelerating the standard and amount of web site traffic by increasing the visibility of an internet site or an online page to users of an online programme. SEO refers to the advance of unpaid results (known as "natural" or "organic" results) and excludes direct traffic/visitors and also the purchase of paid placement. SEO could target totally different forms of searches, together with image search, video search, educational search, news search, and industry-specific vertical search engines. Optimizing an internet site could involve writing its content, adding content, and modifying hypertext markup language and associated committal to writing to each increase its relevancy to specific keywords and take away barriers to the categorisation activities of search engines. Promoting a website to extend the amount of backlinks, or incoming links, is another SEO manoeuvre. By could 2015, mobile search had surpassed desktop search. As an online selling strategy, SEO considers however search engines work, the computer-programmed algorithms that dictate programme behavior, what folks explore for, the particular search terms or keywords written into search engines, and that search engines square measure most popular by their targeted audience. SEO is performed as a result of an internet site can receive additional guests from a research engine the upper the web site ranks within the programme results page (SERP). These guests will then be born-again into customers. SEO differs from native programme improvement therein the latter is targeted on optimizing a business' on-line presence in order that its websites are displayed by search engines once a user enters a neighborhood explore for its merchandise or services. the previous instead is additional centered on national or international searches.