Search Engine Marketing (SEM) is an effective way to grow your business in a competitive market. With so many businesses out there, it’s never been more significant to promote online, and search engine marketing is one of the best ways to promote your products and services and expand your business.
Source : http://www.edustudy.org/blogs/detail/what-is-sem-and-how-it-can-drive-traffic-to-your-website-90