Cost-Per-Click ads are delivered in categories matching your specific business, as well as other similar categories that our ad delivery system has identified as relevant. The price you pay per click is based on competition and relevance, but you'll always pay the least amount needed to win the click. We aim to maximize the number of clicks you get for your budget over the course of the month, and you should plan to have 100% of your budget fulfilled. Occasionally competitive demand prevents this, but you'll only be billed for the cost of the clicks you received in that monthly billing period.
For a more detailed description of how CPC ads work, watch our video: