Clickbank is like amazon but for digital products. You pick a product to promote and when someone buys through you, you get a a percentage.
The percentage you get for digital products is much higher than the one you get for physical products because there's no manufacturing cost.
So instead of promoting an amazon product and getting 8%, you can promote the ebook Truth About Abs and get 75%.
The downside with promoting digital products is that it's much more difficult to find long tail keywords to rank for in the search engines.
