Affiliate e-commerce marketing is when an affiliate — a person or company — promotes another company's product online. Affiliates earn a commission on every sale of the product they are helping to market. For a e-commerce business, affiliate marketing is like icing on the cake — the cake being traditional e-commerce marketing. There are obvious benefits for both sides in affiliate marketing. A company can tap into the affiliate’s audience and expertise to gain customers and generate sales, and affiliates can grow their own audience while earning revenue.