Affiliate marketing is a form of online marketing where an individual, called an affiliate, promotes products or services from another company to earn a commission on any sales generated from their promotions. The affiliate will create links to the products or services they are promoting, and when a customer clicks on those links and makes a purchase, the affiliate will earn a commission from the company. Affiliate marketing is a great way to earn money online, as it allows affiliates to earn commissions from any product or service they promote.