What is Click-through rates? Click-Through Rate(CTR) is the percent of users that click a link from your email compared to the total amount that opened it. Unique CTR only looks at one click per user. So if a user clicks multiple links then only the first click will be counted. Click-through rate is a metric that can help determine the success of your email campaigns. A high CTR means that your email was engaging and that users wanted to click through to read more or buy your product.