Google AdSense

Google AdSense is the market leading program operated by Google that provides relevant text, images, and video-based advertisements to site owners. An advertisers would register at Google AdWords and then pay for ads on a Pay Per Click, Cost Per Thousand or Cost Per Action basis. This revenue is shared with Google AdSense host sites, normally on a PPC basis (which has been known to lead to Click Fraud).

Google then uses its search Algorithms and Contextual Link Inventory to provide what it believes to be the most appropriate ads based on site content, query relevancy, page ranking and other factors the Algorithm uses to find results.