Stands for "Cost Per Click," and is used in online advertising. CPC defines how much revenue a publisher receives each time a user clicks an advertisement link on his website. For example, a publisher may place text or image-based ads on his website. When a visitor clicks one of the advertisements, he or she is directed to the advertiser's website. Each click is recorded by the advertiser's tracking system and the publisher is paid a certain amount based on the CPC.