In Google Ads, quality score is a diagnostic tool that evaluates your ad’s overall quality and relevance based on factors like ad relevance, click-through rate (CTR), and landing page experience. It is rated on the scale of 1 to 10, with 1 being the worst and 10 being the best. Quality score affects your ad’s position in search results and the cost you pay for clicks. Google usually rewards ads with higher quality scores with better positions, more visibility, and lower ad costs.