[pullquote]What is Affiliate Marketing? In a nutshell – it is the process of advertising on a cost per action basis. It can include any digital promotion that results in remuneration based on an action including; cost per lead, cost per sale, cost per booking, cost per acquisition.[/pullquote]
Ahrefs has published a great overview of Affiliate marketing for 2020 that runs down what affiliate marketing is, where it stands among other types of digital marketing, and how affiliate marketing works.
If you are looking to generate revenue through affiliate marketing revenue, this is a great video to help you get started.