Online affiliate marketing is a performance-based strategy where individuals (affiliates) promote products or services from a company and earn a commission for each sale, lead, or click generated through their unique referral link. It’s a popular and cost-effective way for businesses to expand their reach, and for affiliates to earn passive income by leveraging blogs, social media, websites, or email marketing. With low startup costs and flexible working conditions, online affiliate marketing has become one of the most accessible and scalable online income streams for beginners and professionals alike.