Affiliate programs, as one of the most important tools of Internet marketing, contribute to a significant reduction in the cost of attracting customers, since their success depends on results, and not on fixed costs. The impact of partner programs on the development of e-commerce is argued, emphasizing their key role in increasing sales and expanding the client base. The main mechanisms of affiliate programs, such as CPA (cost per action) and CPC (cost per click) payments, as well as their influence on customer behavior, are analyzed. It is substantiated how an effective partner program helps companies enter new markets and expand sales geography, using external traffic and minimizing risks. Structured best practices for partner relationship management, including selecting the right partners, monitoring their performance, and implementing analytics tools to assess the impact of partner traffic. Practical examples of successful cases that demonstrated an increase in sales volumes and strengthening of the brand are argued. It has been proven that partner programs are becoming an integral part of the strategy of many online stores, offering mutually beneficial cooperation and becoming an important factor in the sustainable development of e-commerce.