What Does Click-Through Rate (CTR) Mean?

Click-through rate (CTR) refers to the number of times a user clicks on a Web page advertisement compared to the total numbers of visitors viewing the ad.

Techopedia Explains Click-Through Rate (CTR)

In order to measure consumers’ interest in an advertised product, the click-through rate is calculated. For example, suppose that 100 visitors go to XYZ.com, which sells computer routers. On XYZ’s website is a specific advertisement that shows a brand of router for sale. Of those 100 website visitors, one person clicks on the advertisement. Thus, the click-through ratio is calculated as 100 visitors divided by one click on advertisement, which equates to a 1 percent click-through rate.