What is the quality score?
Ranking system used by search engines such as Google, Yahoo or Bing, to assess the quality of ads, keywords and landing pages. It is a score from 1 to 10 –10 is the maximum value– that determines in which position the ad will be displayed and the price that the advertiser will have to pay for each click. Among the many factors that influence this rating are the expected clickthrough rate, the relevance of the ad text, the landing page experience, and the advertiser's performance history.
Other denominations:
Quality level