Ad clicks measure how often users interact with online advertisements by clicking on them. When clicked, users are redirected to the advertiser's website or a specific landing page and this action signifies a user's interest in the advertised product, service or content, making ad clicks a valuable indicator of potential engagement and conversion.

The number of ad clicks generated by a campaign is often seen as a measure of its success. A higher click-through rate (CTR), which is the ratio of ad clicks to impressions (the number of times an ad is displayed), indicates a greater level of user engagement and a more effective ad. Ad clicks play an important role in various online advertising models, including affiliate marketing, paid search and display advertising.

For affiliate marketers, ad clicks are essential for tracking the performance of their promotional efforts and calculating commissions based on the traffic they drive to the advertiser's website. In paid search campaigns, ad clicks are used to determine the cost per click (CPC), which is the amount advertisers pay for each click on their ads. Display advertising campaigns also rely on ad clicks to measure the effectiveness of their visual ads in capturing user attention and driving traffic to their intended destinations.