What are benefits the affiliates get from an affiliate relationship?

1. No product or service to carry:
Online business with your own product or service might be rewarding, but it requires substantial investment from your. With carefully chosen affiliate programs, you can have your online business without the requirement of having your own product. Indeed, the investment is low as all you need is a website.

2. Possibility of residual income:
Many programs pay you a commision from the sales made to the customers generated from affiliates, who have signed up as an affiliate following your link. This kind of affiliate system is called 2-tier system.
Visitor tracking sytem allows affiliate programs to pay you a commision when the same visitor from your website makes repeat purchase.