Definition of Quality score

An assessment in paid search by Google AdWords (and now other search engines) of an individual ad triggered by a keyword which, in combination with the bid amount, determines the ranking of the ad relative to competitors. The primary factor is the click-through rate for each ad, but quality score also considers the match between the keyword and the occurrence of the keyword in the text, historical click-through rates, the engagement of the searcher when they click through to the site and the speed at which the page loads.

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