Clickthrough

Also referred to as click-thru, click-through, clickthru or simply click, is the process of a visitor clicking on a link (generally being a text or graphical link supplied by an advertiser).

The clickthrough ratio (CTR) measures the frequency at which an ad is clicked in relation to the number of times it has appeared. As such, a CTR of 2% (or 0.02) suggests that for every 100 impressions, the ad received 2 clicks.