► Quality Score is Google’s rating of the quality and relevance of both your keywords and PPC ads. It is used to determine your cost per click (CPC) and multiplied by your maximum bid to determine your ad rank. The relevance of each keyword to its ad group. Landing page quality and relevance.
► To determine the position of the ad on a search engine, each ad is allocated with adrank which is the product of bid * Quality Score. Ads are then listed in descending order based on the result of that equation. The exact weight of Quality Score versus bid has not been revealed by any of the major search engines, and each company has stated that they reserve the right to continually adjust their ranking methodologies.
SEO/SEM is a growing, high-powered marketing force. Search Engine Marketing ensures that the people who need you, will find you on the Internet.