Just as the popularity of affiliate marketing has shifted into greater heights, so has the people's outlook about it changed. No longer is affiliate marketing considered today as an alternative method for the merchant to advertise his products, or as a source of additional income for the affiliates. For merchants and affiliates alike, affiliate marketing is now considered as a main source of profits and revenues.

There are actually different types or classes of affiliate marketing, and the number of types will depend on how one will classify them. The most basic affiliate marketing programs, however, falls under two categories: pay-per-click (PPC), and pay-per-performance (PPP).