Steve Jobs once said people don't read any more. Luckily, he changed his mind and Apple's engineers and designers managed to break speed records in getting iBooks, the iOS answer to Amazon's Kindle, fast tracked onto the App Store in time for the original iPad event.
Unlike music and video, iBooks doesn't have a separate store. The iBookstore is built right in to the App Store as its own section. Apple has also added iBooks Textbooks, and iBooks Author to their lineup, though iBooks Author still lacks iPhone support. With iOS 7, iBooks finally came to the Mac as well, and built-in! With the introduction of iOS 8 this fall, iBooks will also come built in to every iPhone and iPad.
Once you've downloaded books to iBooks, whether they were free or purchased, you can highlight, markup, leave notes, and save as many bookmarks as you'd like. This makes it ideal for students and anyone else who is studying research materials. Not only can you store books in iBooks, you can also open and manage PDFs. There are several views available in iBooks that allow you to sort through and manage all your media easily. If you have notes that you've saved on books, you can also print them using AirPrint in just a few taps.
While there are many different apps available in the App Store that allow you to purchase and read books, iBooks is supported throughout iOS which makes it a great tool for opening and managing documents on the go.