Since July 2014 I read for the first time about affiliate marketing, I never heard of this way of working before. Until then, I have worked in MLM (multi-level-marketing). Which wasn't that suitable for me. MLM is a very aggressive way of marketing, and you do need to harass everyone around you to join. That's not quite me. Affiliate marketing works very different. You write reviews about products of a company, and when people decide to buy something after reading your review, you get a few percentage of the sale. That's more my line of work.
Affiliate marketing is also called "performance marketing", in reference to how sales employees are typically being compensated. Such employees are typically paid a commission for each sale they close, and sometimes are paid performance incentives for exceeding objectives. Affiliates are not employed by the advertiser whose products or services they promote, but the compensation models applied to affiliate marketing are very similar to the ones used for people in the advertisers' internal sales department.