Though nothing beats reading a book, an audio book is also good to listen to when you’re riding a bus, while waiting in a doctor’s clinic or before going to sleep. And for some practical reasons, it costs less than buying a real book, and it saves plenty of trees (very eco-friendly), and it’s also very quick to get hold of especially that you can download it easily from the internet anytime. You can also choose where to store it, whether in your mp3 player of CD.