Web Listings Inc. explains in the FAQ section of their site, for clients as well as for people in general, how search engines work.
The Web Listings site clearly states, “Search engines are complicated computer programs, many of which are patented or are trade secrets. For example, the technology that powers the market leader Google's search engine is called PageRank and is described well here. With PageRank, one of the most important requirements is to have several other diverse sites or online directories link to you. This is one attribute of your web visibility that our technology helps you optimize.”
It's this grasp over the online media that makes Web Listings Inc. the most prominent name in website optimisation and it's such knowledge that it imparts to people that makes the company popular.
