What is CTR?
CTR is short for click through rate. Ctr refers to the percantage of clicks generated for impressions. Even though advertisers do not always pay per click, we recommend our publishers to place their tags in spaced which can generate high CTR.
A side note; advertisers who pay on impression basis may not set click tracking on their side all the time. So the click number may not always show the total clicks generated on your placements. Still this does not mean that you miss revenue, you are being paid for impressions in those cases.