Affiliate marketing networks act as the middlemen between publishers (aka affiliates) and advertisers (brands). Using affiliate marketing networks, brands with affiliate programs can discover suitable affiliates and hire them to promote their products and help drive sales. The Amazon affiliate program, Amazon Associates, currently boasts the largest market share of affiliate networks (46.15%), followed by CJ Affiliate, formerly Commission Junction (8.13%), and Rakuten Affiliate Network (7.85%).  Below are some other popular affiliate marketing networks: Awin. ClickBank. Shareasale. FlexOffers.