Shawn Collins of http://www.extramoneyanswer...
explains affiliate marketing, and how it is essentially selling stuff you don't own to people you don't know.
In this example, he discusses how you could create a fan site for a football team.
The site would include your opinions of the team, players, coaches, etc. And it would also include related ads for products like jerseys, helmets, and DVDs.
Whenever other fans visited the site, clicked through the ads, and made a purchase, you'd earn a commission on the sale.