Affiliate marketing is an online industry that is constantly growing and evolving. And while it might seem easy to jump into, many things come along with starting a successful affiliate marketing campaign. Most people don't realize that affiliate marketing isn't just about making money -- it's about building a long-term sustainable income stream. That being said, affiliate marketing is still a highly lucrative way to make money online. If you're willing to put in the effort, you can build a passive income stream.