Cost per click, also known as CPC, is a digital marketing term that refers to the amount of money an advertiser pays each time a user clicks on their online advertisement. This type of advertising model is commonly used in pay-per-click (PPC) campaigns, where advertisers only pay for the actual clicks their ads receive, rather than for the number of times the ad is displayed. The cost per click is determined by factors such as the competitiveness of the keywords used in the ad, the quality of the ad, and the target audience. It is an important metric for advertisers to track, as it directly impacts the return on investment (ROI) of their online advertising efforts.