Pay Per Click
Pay per click (PPC) is also known as Cost per click (CPC). It is a great marketing tool and of the most powerful ways to earn income on the internet today.
PPC affiliate programs are available from different service providers, firms like Google through their Adsense and Adwords platforms, Yahoo's Search Affiliate Marketing and MSN's Adcenter.
However, smaller PPC networks and programs are also available giving you the opportunity to create healthy relationships with smaller advertisers and niche merchants.
The beauty of Pay Per Click affiliate programs is that you get paid every time a user clicks on the link. As an affiliate, thus, you are not responsible for making sure that the sale gets completed on the other end.
PPC affiliate programs are typically available on specific keywords that are determined and optimized by the ad-serving software. In order to be a responsible PPC promoter, you have to be diligent in detecting any kind of fraud; else you can be kicked out of the program without receiving any commission. You could talk to your service provider to learn about being a more responsible PPC advertiser.