Learn from the master of Guerilla Marketing. In this free report he introduces new concepts and ideas on how to pump up your websites muscles. If you have your own website these are pretty good. Companies list with an affiliate program as a seller for a fee. For that fee they get people like you and me to put ads on our websites for them and they pay us for clickthrus, leads, exposure and sales.
Different merchants pay different amounts for each.
I belong to several affiliate programs. This program involves placing banner code on as many pages as you want but the difference is that ValueClick rotates what goes in that banner space automatically. You do have some control over what can and cannot be displayed on your site and can eliminate types of sites OR individual sites. You only get paid if a visitor to your site clicks on the banner. I am a ValueClick Affiliate.