Affiliate marketing is a type of online marketing in which an affiliate promotes a product or service on behalf of a company and receives a commission for each sale made through their unique affiliate link. Essentially, an affiliate acts as a middleman between the company and the customer, promoting the company's product or service to potential customers and earning a commission for each sale that they generate.

The commission structure and payment terms vary depending on the company and the affiliate program. In some cases, affiliates may be paid a percentage of the sale price, while in others, they may receive a flat fee for each sale made. Affiliate marketing is a popular way for companies to promote their products or services, as it allows them to reach a wider audience and increase sales without having to invest in expensive advertising campaigns. At the same time, it allows affiliates to earn money by promoting products or services that they believe in and that are relevant to their audience.