SEM

Search engine marketing, , or SEM, is similar to search engine optimization but focuses less on natural rankings and more on the actual promotion of a website. SEM techniques generally include natural SEO but almost always branches out to include contextual or paid search advertising.
Paid search advertising models became more prominent in the late 1990's, after the search engines themselves became more popular. SEM focuses more on business-oriented websites and their overall online marketing strategies. Because many of the paid advertisements appear at the top of the search engines, the FTC in 2002 responded to complaints by clarifying that paid advertisements and website listings must be clearly denoted so that consumers do not confuse them with websites that have obtained high rankings naturally.
It really doesn't matter what type of website you have, whether it's personal or geared towards your business. Incorporating search engine optimization techniques into the creation and ongoing upkeep of your site will ensure you receive higher levels of traffic and, ultimately, greater success.