olemus
reklaamelemendile klõpsamiste arvu ja selle elemendi avaldamiskordade arvu suhe, tavaliselt protsentides
Wiktionary:
(Internet, advertising) a ratio of the number of clicks on a unit of online advertising to the number of times it is shown

ülevaateid
https://en.wikipedia.org/wiki/Click-through_rate
https://core.ac.uk/download/pdf/77239939.pdf
https://www.ijcai.org/Proceedings/2018/0277.pdf
https://arxiv.org/pdf/1701.08744.pdf