The most common Google AdWords interview question, Google AdWords’s Quality Score is a rating given based on multiple factors like relevancy of keywords used, Click through rate, landing page quality and relevance, ad text relevant and the historical performance of the ads account performance.
Google AdWords gives Quality score to each keyword on a scale of 1 to 10 and includes expected CTR, ad relevance and landing page experience. Basically, it’s a measurement of how relevant your ad to the user’s intent. Better the quality score, ad rank will get improved without spending more.