Search Engine Marketing: The act of marketing a website via search engines to drive dramatically increased amounts of profitable traffic to your site with the best return on investment. SEM is a form of Internet marketing that helps to promote websites by increasing their visibility in search engine result pages. Search Engine Marketing is a broad term that describes all of the activities used to promote websites. Many marketers have difficulty understanding search engine marketing and they rely on third-party agencies to manage their search marketing. ln any successful marketing strategy, it is important to ensure that you know whom your audience is and how to reach them. In the same way, search engine marketers must ensure that their SEO campaign targets the correct keywords or search phrases. A Search Engine Marketing Professional knows the ways to locate your site among the top pages of websites on World Wide Web. For this, they have Search engine optimization tools and tactics.