Earning income online from home can have many options. Many people believe that ‘residual income’ is one of the smartest ways to go. This belief is based on the fact that when you make the sale once, it can represent a monthly income as well. Affiliate programs are a prime example. You are paid a commission when someone joins a program using your affiliate ID. (in your downline). Then each month when your downline pays their monthly fees, you get a percentage of that fee as a commission from the affiliate program. This is what they mean by ‘residual income’.