There are huge differences between eBook and Audiobooks.
eBook is a digital version of a book, which allows users to read the books without carrying out the heavy book at any time anywhere. It can be read on mobile, browser, web app and others. It requires Internet to download or to read when reading the eBook.
Audiobooks is an audio version of a book, which allows users to listen to the books. With audiobooks, users can enjoy books with ease. It is formatted like the popular file format, MP3 or others, like AA, AAX, M4B and more.