What Do you understand about Affiliate Marketing?

Wait.. Why is everyone talking about affiliate marketing today? Have you ever asked yourself this question? Since the past one year, majority of Nigerians have signed up as affiliate marketers for some reasons best known to them. Some say it is the best way to earn passive income online, others say it does not involve stress, and a whole lot of thoughts.

Now, this thread is open. I want you to comment below, giving the best definition of what you understand about Affiliate marketing.

1. The First to comment will be picked.
2. The first person to give the right answer will be picked too.
3. The 20th, 25, 30, 35, 40, 45, 50, 55, 60th person to comment will also be picked.