According to Wikipedia
|How to Make Money Online with Affiliate Marketing.|
Basically, you as a publisher will be rewarded when you help a business by promoting their products or services. So for example, if you sign up for Amazon’s affiliate program and promote it’s products then you will get a commission when the visitor you send from your site or Affiliate link that you shares with others who makes a purchase. Which helps you to increase your earning. There many websites for affiliate marketing but I recommend below.