Search engines are places people go to search for things on the internet, such as Yahoo!, Google, or Bing. Most search engines provide websites with two ways of appearing: Natural (organic) listings and Paid listings. Natural Listings, also referred to as organic listings, appear based on the search engines’ own formulae. You can’t pay to have your site listed higher (although some search engines require that you pay to be included in the Natural listings), but you can perform Search Engine Optimization (SEO). Paid Listings usually appear above or to the side of Natural listings and are typically identifiable as advertisements. The most common cost for advertising on Paid listings through Paid Search is Pay-per-Click (PPC).