This is the percentage of people that viewed your ad and clicked on the link. The CTR of your ad indicates how many link clicks you received in comparison to how many impressions (how many times your ad was viewed on the platform) your ad received. It is a widely used metric by online advertisers to evaluate how ads drive visitors to websites and other sites. Facebook determines your CTR by dividing the total number of clicks on an ad by the total number of impressions. After that, the result is multiplied by 100 and expressed as a percentage.