Click-through rate is the ratio between the number of clicks an ad gets to the number of visitors to the site where the ad is displayed. Go on, disable your Ad-blocking software and click an ad…your action will become a statistic in that ad’s click through rate.
For example…
Let’s say Books 4 You decided to offer 20% of books for all those people who clicked on their ad. They advertised this on the front page of a major newspaper’s website. Lots of people notice the ad and click on it. If the newspaper website received 20,000 visits on one day and 1000 people clicked on the ad, the click-through rate for the ad on that day is 5%.