Affiliate marketing is a performance-based marketing in which a business rewards one or more affiliates for each visitor or customer brought by the affiliate’s own marketing efforts. The industry has four core players: the merchant (also known as ‘retailer’ or ‘brand’), the network (that contains offers for the affiliate to choose from and also takes care of the payments), the publisher (also known as ‘the affiliate’), and the customer. The market has grown in complexity, resulting in the emergence of a secondary tier of players, including affiliate management agencies, super-affiliates and specialized third party vendors.

Affiliate marketing generally confused with referral marketing, as both forms of marketing use third parties to drive sales to the retailer. However, both are distinct forms of marketing and the main difference between them is that affiliate marketing relies purely on financial motivations to drive sales while referral marketing relies on trust and personal relationships to drive sales.