Click-Through Rate (CTR): The click-through rate is the percentage of your audience that advances (or, clicks through) from one part of your website to the next step of your marketing campaign. As a mathematical equation, it's the total number of clicks that your page or CTA (Call-To-Action) receives divided by the number of opportunities that people had to click (example: number of pageviews, emails sent, etc). CTR is an important metric to measure the effectiveness of your online marketing efforts and to optimize your ads, emails, or web content.