Affiliate marketing involves passive income because, as an affiliate for someone else, you earn a commission for marketing another person’s or company’s products.
As an affiliate, you simply search for a product you enjoy, then you promote that product and earn a piece of the profit from each sale they make. The sales are tracked via affiliate links from one website to another.
Matt McWilliams has courses that help you figure out how all this works - how to make money from marketing other people's products.
Check it out here: