In the case of promoting consumer products, like tools, books, toys and household items, the biggest affiliate network, by far, is Amazon. Amazon Associates affiliate program lets you promote any item that is sold on their platform. Amazon Associates is Amazon’s affiliate marketing program that allows website owners and bloggers to create links and earn referral fees when customers click through and buy products from Amazon. It’s completely free to join and easy to use.
Affiliate networks offer you access to multiple (and by multiple, we mean hundreds if not thousands) of individual affiliate programs. They basically work by simplifying the signup process - instead of applying to become an affiliate for a each product you want to promote, you simply apply to join the network and instantly have access to hundreds of different affiliate offers.