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 (both on-page and off-page) as well as through advertising (paid placements, contextual advertising, and paid inclusions). Depending on the context, SEM can be an umbrella term for various means of marketing a website including search engine optimization (SEO)
I am working on SEO and SEM since 2009 and 5/yrs experience on SEO and SEM. I have done so many contracts in Elance on WordPress site development, SEO, SEM and HIgh Quality Backlink with success. My employer was very happy with the project result. I always update my SEO skill for google and I am very careful about google Panda and Penguin new rules. I believe, if any one follows and maintenance this rule, then his/her website will become in Google top rank.