Affiliate marketing is a performance-based marketing strategy where individuals promote products or services online and earn a commission for every sale or lead generated through their referral links. Businesses benefit by expanding their reach, while affiliates can earn passive income through blogs, social media, websites, or email marketing. Successful affiliate marketers focus on building trust with their audience by recommending valuable and relevant products. Popular affiliate programs include Amazon Associates and ShareASale. With low startup costs and flexible working opportunities, affiliate marketing has become a popular way for entrepreneurs and content creators to monetize their online presence and grow sustainable digital businesses.