Digital audiobooks are specially designed for computer media players like iTunes, Winamp and Windows Media Player, and for portable media players like the Zune, iPod and the Sony Walkman MP3 Player. You can download digital audiobooks from sites like iTunes, Audible and Rhapsody, and they use file formats like the M4B format, AA format and the AAX format.
An enhanced audiobook is a type of digital audiobook. Like other digital audiobooks, you can download them from the Internet, but unlike your standard digital audiobook, an enhanced audiobook offers interactive features. For example, an enhanced children's book might include features that allow young readers to click on parts of a page to access supplementary audio or visual content.
Books on CD contain the same type of spoken word readings as digital audiobooks, but they appear specifically on compact discs. You can listen to them using a CD player, or you can import them onto a computer and treat them as digital audiobooks. Once imported onto your PC, you can then transfer them to an MP3 player or enjoy them using your computer's primary digital media player.
Unlike digital audiobooks and books on CD, an audiotape uses a purely analogue format. As a result, you can't transfer this medium to a computer without recording the audio in real time. You can enjoy audiotapes using an audiocassette player, although major publishing companies no longer produce audio books in this format. You can find older books in cassette form, sometimes in used book stores and libraries.