Affiliate marketing is one of the biggest marketing techniques on the Internet.
The concept is simple, you create a banner or text link to your site, and place it on your affiliates site. When an individual at that site clicks on the link they are automatically brought to your site and will presumably buy something at your site. Always know upfront what the referral fee is. It sounds simple but if they won't tell you - don't join the program. Understand how the affiliate fee is calculated.