i. You will use Product Advertising Content only in a lawful manner in accordance with and within the express scope of the terms of this License. You will not use PA API, Data Feeds, or Product Advertising Content with any site or application, or in any other manner, that does not have the principal purpose of advertising and marketing an Amazon Site and driving sales of products and services on an Amazon Site.
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.