Impressions (also called Ad impressions) is the amount of times that your ad has been rendered/displayed on a website. The impression is counted regardless if it's clicked or not.
Read more about how Bannerflow tracks impressions, and why data sometime differs between different platforms.
Clicks are the number of time your ad has been clicked. An ad can be clicked multiple times by the same user, but if the user for example double click on the ad, it only counts as one.
CTR, abbreviated from Click Through Rate, is the percent amount of clicks divided by the amount of impressions.
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