Clickbank is a popular affiliate marketing program that you can use for free and you don't even need a website do use this program. Therefore, if you are a popular youtuber or a blogger, or have a huge social media following, you can easily make money without spending a dime. However, I have not used clickbank. Many years ago when I heard about clickbank, I wanted to give it a try but back then the program was not available in my location.