What does Quality score mean?

Quality Score is a diagnostic metric in Google Ads that shows how high-quality and relevant your ads and landing pages are compared to other advertisers. It is rated on a scale of 1 to 10 at the keyword level. The calculation is based on three main areas: expected click-through rate, ad relevance and landing page experience. A higher score usually means the ad better matches what the user is searching for. Quality Score is used mainly to uncover weak points in campaigns; it is not in itself a direct input to the ad auction or the main KPI of a campaign.