Using this application is very simple: you just have to introduce any book that you have previously bought in Apple's virtual store and click its cover. You will instantly go to the index of the book and you will be able to begin reading it without further problems.
Another option is to include PDF files that you have on your device, something you can do in two different ways: either synchronizing it with your own computer or sending the files by e-mail and downloading them to your device.
iBooks is an incredibly useful tool for book-lovers, and although it is best enjoyed in an iPad, its use on iPhone and iPod touch is highly recommended.
Compatible with iPhone, iPod touch and iPad.