on NonFiction Authors Association:
For a while now I’ve admired various book pages on Amazon that feature visual content like reviews placed on bright images, colorful advertisements, and other graphically enhanced promotions for books. This enhanced content has been a feature previously only available to traditional publishers, but Amazon finally made it available to books published on the KDP platform.
The program is called A+ Content and it can be a fun opportunity for KDP authors to boost promotion value on book pages. Here are some examples of A+ content from book pages on Amazon:
Chris The Story Reading Ape's Blog 