_iTunes is a free application for Mac and PC. It plays and manage all your digital music and video. It syncs content to your iPod, iPad, iPhone, and Apple TV. And it's an entertainment superstore that stays open 24/7.

About iTunes 10.5.3:
iTunes 10.5.3 allows you to sync interactive iBooks textbooks to your iPad. These Multi-Touch textbooks are available for purchase from the iTunes Store on your Mac or from the iBookstore included with iBooks 2 on your iPad.
iBooks textbooks are created with iBooks Author — now available as a free download on the Mac App Store.
For information on the security content of this update, please visit: support.apple.com/kb/HT1222

Download: iTunes 10.5.3 x86 | 64-bit (Windows) | macOS

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Apple today released iTunes 10.5, bringing support for iOS 5 and iCloud as well as new Wi-Fi syncing capabilities.
iOS 5 and iCloud are set to launch tomorrow, and today's launch of iTunes 10.5 sets the stage for those releases.

So, what's new in iTunes 10.5:

• iTunes in the Cloud. iTunes now stores your music and TV purchases in iCloud and makes them available on your devices anywhere, any time, at no additional cost.
  
  • Automatic Downloads. Purchase music from any device or computer and automatically download a copy to your Mac and iOS devices.
    
    
  • Download Previous Purchases. Download your past music, TV, app, and book purchases again, at no additional cost. Previous purchases may be unavailable if they are no longer on the iTunes Store.
    
• Sync with your iPhone, iPad, or iPod touch with iOS 5.
  
• Wi-Fi Syncing. Automatically sync your iPhone, iPad, or iPod touch with iTunes any time they're both on the same Wi-Fi network.