Click-Through Rate

Click-through rate is the ratio of users who click on a specific link to the number of total users who view a page, email, or advertisement. It is commonly used to measure the success of an online advertising campaign for a particular website as well as the effectiveness of email campaigns.
The click-through rate (CTR) of a re-targeted ad is 10 times higher than the CTR of a typical display ad.
https://www.digitalinformationworld.com/2014/09/infographic-retargeting-advertising-statistics.html

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