Commission Junction, also known as CJ Affiliate, is an online platform that connects advertisers with publishers to facilitate affiliate marketing. Advertisers can promote their products or services through various publishers, who earn commissions for driving traffic or sales to the advertisers' websites. The platform offers tools and resources for both advertisers and publishers to track performance and optimize their marketing strategies. By joining Commission Junction, businesses can expand their reach, while publishers can monetize their content by promoting relevant products to their audience.