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BEFORE YOU CAN BUY and read an Apple ebook on your iPad, you have to do two things: recalibrate your brain, because Apple calls ebooks iBooks, and then pop into the iTunes App Store to download Apple’s free iBooks app. You can get it a couple of ways.
On the iPad. Grab the iBooks app by tapping the App Store icon on the Home screen. If you don’t get an on-screen iOS alert message with an invitation to download the app right off the bat, you can always find the app yourself. You might see an iBooks icon on the App Store’s main page, or you can tap the Search box at the top of the screen, type in iBooks, and wait for the app to pop up. Then tap the Install App button.