In the context of affiliate marketing, an affiliate is an individual or company that partners with a business to promote its products or services. The affiliate earns a commission for each sale, click, or lead generated from their marketing efforts. Affiliates use various channels for promotion, including blogs, social media, email lists, and websites. The affiliate marketing model is performance-based, meaning affiliates are only paid when their promotional activities result in a transaction. It's a popular method for businesses to expand their marketing reach and for individuals or companies to monetize their audience base.