The cost-per-click (CPC) is the amount you pay each time a user clicks on your ad. The CPC for any ad is determined by the advertiser, and some advertisers may be willing to pay more per click than others. If your ads are bid on a CPC basis, you will be charged when users click on your ads and visit your website. Your total charges are based on the amount you spent on the ad divided by all clicks the ad received.