Search engine marketing is a form of internet marketing
Search engine marketing (SEM) is a form of Internet marketing that involves the promotion of websites by increasing their visibility in search engine results pages (SERPs) through optimization and advertising. SEM may use search engine optimization (SEO), that adjusts or rewrites website content to achieve a higher ranking in search engine results pages or use pay per click listings.
Search engine marketing - Wikipedia, the free encyclopedia
There are four categories of methods and metrics used to optimize websites through search engine marketing.