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Definition of Click-Through Rate (CTR)

The average number of click-throughs per hundred ad impressions, expressed as a percentage.

It is important to distinguish what a click-through rate does and does not measure. The CTR measures what percentage of people clicked on the ad to arrive at the destination site; it does not include the people who failed to click, yet arrived at the site later as a result of seeing the ad.

As such, the CTR may be seen as a measure of the immediate response to an ad, but not the overall response to an ad. The exception involves ads that display no identifiable information about the destination site; in these cases the click rate equals the overall rate.

Merely getting visitors to a site had value when Web site traffic was generally accepted as a measure of success. The trend towards profitability, along with better tracking tools, has resulted in less interest in click-through rates and more interest in conversion rates.

A high click-through rate does not assure a good conversion rate, and the two rates may even share an inverse relationship. An advertisement geared towards curiosity clicks will result in fewer sales, percentage-wise, than an advertisement geared towards qualified clicks.