Multimedia digital audiobook format developed by Audible; may be used by audiobooks available from Audible.com, AudibleKids, and the iTunes Store; similar to the standard .AA audiobook file type, but may include other features such as images and links.
Since AAX files support images, they are often used for kid's books. AudibleKids has two types of Enhanced Audiobooks: Picture Books and Graphic Novels. The images are automatically shown as the user listens to the story.
AAX files can be played by iTunes and are also supported by the Apple iPod and the Amazon Kindle 2. However, before playing the files, users need an Audible.com account, which requires a subscription fee.