A Google Advertising metric that determines how relevant your pay-per-click (PPC) ads and landing pages are to the keywords you’ve selected. Google doesn’t divulge its specific formula, but it’s based on the relevancy of the ad to the keywords, the predicted click-through rate (CTR), and the landing page experience. Google suggests improving your advertising and landing pages, as well as revising your keyword strategy, if you want to enhance your Quality Score.