Affiliate marketing lets someone make money by promoting another person's business. You could be either the promoter or the business who works with the promoter, but the process is the same in either case.
It works using a revenue sharing model. If you're the affiliate, you get a commission every time someone purchases the item that you promote. If you're the merchant, you pay the affiliate for every sale they help you make.
Some affiliate marketers choose to review the products of just 1 company, perhaps on a blog or other third-party site. Others have relationships with multiple merchants.
Whether you want to be an affiliate or find one, the first step is to make a connection with the other party. You can use a platform designed to connect affiliates with retailers, or you can start or join a single-retailer program.
If you're a retailer and you choose to work directly with affiliates, there are many things you can do to make your program appealing to potential promoters. You'll need to provide those affiliates with the tools that they need to succeed. That includes incentives for great results as well as marketing support and pre-made materials.