Believe me, there are very few people who knows exactly what is affiliate marketing and here in this video JOE has described things very simply for the beginners.
This might be a stupid question, but it is the first step you need to take as a learner. According to WikiPedia –
Affiliate marketing is a type of performance-based marketing in which a business rewards one or more affiliates for each visitor or customer brought by the affiliate’s own marketing efforts.
I hope you will watch the video till the end and ask any questions you have.
So, was it necessary to learn this? … YES.. this is very necessary to learn everything about Affiliate marketing before you jump into the world.