There are many different ways to earn income from home online. Many people who have worked in the Internet marketing industry believe ‘Residual Income’ is the smartest strategy to use because for one thing it is based on the theory that it is wise that when you make a sale once that sale represents a monthly income going forward. With affiliate programs, when someone joins a program in your down-line you are paid a commission for the initial referral. Then for as long as they pay their monthly membership fee, you get a percentage of that fee as a commission. This is a primary example of what is called ‘residual income’.