A vBook, short for a virtual book, is a book published and accessible online.
Contrary to an eBook - an electronic book - a virtual book can include richer, more interactive content. While an eBook is usually based on text and images, a virtual book may consist of videos, sound and interactive exercises or other functionalities.
To read a vBook, you need a username and password to log in. You can access the vBook with any device - computer, tablet, or cell phone - as long as it has an internet connection.