Click-Through Rate (CTR): Indicates how compelling your ad is; higher CTR generally leads to better ad relevance and lower costs. Conversion Rate: Shows the percentage of clicks that result in sales; a high conversion rate signifies effective targeting and product appeal. Advertising Cost of Sales (ACoS): The ratio of ad spend to sales revenue; lower ACoS means better profitability.... https://bizistech.com/maximize-your-roi-with-amazon-ad-management-service-and-amazon-cost-per-click-management/