The Amazon Media Group (AMG) offers advanced Amazon advertising (both on and off Amazon’s site).
It is most suited to large Amazon Vendors who are perhaps more concerned with market share and brand awareness than a pure advertising and ROI play.
Services include the Amazon Advertising (Programmatic Ads) Platform which allows access to display Ads on third-party websites as well as other Amazon owed web properties.
Smaller Vendors (particularly those who are not Tier two or Tier two Vendors) are likely to see a far more obvious (and manageable) ROI from utilizing Amazon Marketing Services (AMS) instead.