What it means
AMG (Amazon Media Group) was Amazon's media sales unit for display, video, and audio advertising. The term no longer officially exists: in 2018, Amazon merged AMG, AMS (Amazon Marketing Services), and AAP (Amazon Advertising Platform) under the Amazon Advertising umbrella, now called Amazon Ads. If you encounter AMG today, it's a historical reference — its functions live on in Amazon Ads (Sponsored Ads, DSP).