Where SEM is an acronyms of Search Engine Marketing and which is the fastest, most powerful, highly-targeted, most dynamic, highly-measurable and most cost-effective marketing strategy that can give your business the power to reach potential customers anywhere in the world. Search Engine Marketing or SEM is about making sure that your Web site appears on the top 20 of search results every time potential customers search for whatever products and/or services that you offer on any of the major Search Engines including Google, Yahoo and MSN. So Search engine marketing is an alternative to traditional marketing such as commercials, brochures, and print advertising.

There are two kinds of search engine listings. Natural and Paid. Natural listings are the listings that are not paid for. They are determined by the search engines' algorithms for finding, sorting and ranking pages based on relevancy. Because natural listings are considered "more accurate" by searchers, getting in natural listings is typically preferable to getting in paid listings. Paid listings are usually labeled in a separate section such as "sponsored listings.Paid search engine are those returned based on auction type keyword bidding. These listings are displayed in sponsored areas of search results and are paid for on a per-click basis.