Affiliate marketing involves earning a commission by promoting a product or service made by another retailer or advertiser. It is a monetization model where an affiliate partner, example you, gets rewarded a payout for providing a specific result to the retailer or advertisement. Typically, the result is a sale. But some programs can reward you for leads, free-trial users, clicks to a website, or getting downloads for an app. Affiliate programs are usually free to join, so you don’t have to worry about high startup costs. Done well, this performance-based opportunity can go from side hustle to profitable online business idea by netting you a healthy income.