SEO means Search Engine Optimization and SEM means Search Engine Marketing. SEO optimize our site for search engines. SEM optimizing our site for Search Engine Marketing, in the sense of e-commerce, marketing products online buying and selling trade.

For traffic increases, the social networking sites like Facebook, Twitter, MySpace and many more are very important and the other is off page technique as a subject on the forum, blog comments, directory submission, article submission and social book marking is also good to get traffic.