iTunes in the Cloud lets you access content you've bought from Apple's iTunes Store, App Store, and iBookstore, re-download it to your iPhone, iPod touch, and iPad, and to iTunes on your Mac or Windows PC, and stream your music, movies, and TV shows to your Apple TV.
iTunes in the Cloud let's you automatically download any App Store apps, iBookstore iBooks, and iTunes music you buy. For example, if you buy a game on your iPhone, it can automatically download onto your iPad. If you buy a song on iTunes on your Mac or Windows PC, it can automatically download onto your iPod touch.
An iTunes account can only have 10 devices enabled for iTunes in the Cloud at the same time. Devices include iPhones, iPod touches, iPads, as well as Mac and Windows PCs, and Apple TVs. If you reach 10, you can't add an additional devices until you remove one first. (See below.)
If you're not concerned about your cellular data cap or any potential overage charges, you can choose to have iTunes in the Cloud automatic downloads happen even when you're off Wi-Fi and on 3G or 4G.
If you do choose to allow 3G/4G downloads, there's still a maximum file size limit of 50MB. Any content bigger than that can only be downloaded over Wi-Fi.
If you subscribe to any magazines or newspapers in Newsstand, you can choose to have new issues download automatically to your iPhone, iPod touch, and iPad when they become available.
Newsstand content downloads will only happen while on Wi-Fi.
If you have multiple iTunes accounts, for example a personal and a family account, or a family and a business account, or accounts in more than one regional iTunes store, you can change which account is associated with your iPhone, iPod touch, or iPad.
To guard against unfair use or illegal distribution (for example, to stop friends from swapping accounts to get free access to each other's content), you can only change iTunes in the Cloud accounts once every 90 days.
If you reach your 10 device limit for iTunes in the Cloud and need to remove a device, or if you simply lose, sell, or upgrade a device and want it off you account, you can remove it via the iTunes desktop on Mac or Windows.
For a long time now, The App Store has let you re-download paid apps and games without having to pay for them again. Now, however, this functionality is officially part of iCloud and iTunes in the Cloud. It means if you downloaded an app or game a long time ago, on a different device, or simply deleted it because you stopped using it for a while, you can go back and download it again, free of additional charge.
If you know the name of the app you want to re-download:
Note: If you see a price button (e.g. $0.99) instead of an Install button, it means you'll be charged for the download. Make sure you're on the proper iTunes account, and that you've really bought the app previously before re-downloading.
If you don't know the name of the app and need to find it:
Your app will now download to the Home screen of your iPhone, iPad, or iPod touch.
Just like App Store apps, you can easily re-download iBookstore iBooks to your iPhone, iPod touch, and iPad.
Your book will download to your iBooks bookshelf.
Re-downloading music, movies, and TV shows is a little more complicated than re-downloading apps simply because licensing restrictions don't allow it in all areas (yet). Music is currently available in many regions. TV shows and movies are only available in a few countries.
Here's a current listing of which types of content are available for re-downloading and in which area.
If iTunes re-downloads are available in you region, you can safely restore your content to your iPhone, iPod touch, iPad, or iTunes on your Mac or Windows PC without being charged again.
Once you've purchased music, movies, or TV shows from iTunes, you can re-download it at any time, from any iPhone, iPod touch, or iPad you own that's authorized on your iTunes account.
You can view "Not on this iPhone/iPad" to help more easily find the exact content you're looking for.
Once your content has downloaded, you'll be able to find it in the Music or Videos app.
If you're not away from home, and if your HDTV isn't otherwise occupied, there's no better way to enjoy your TV shows and movies them than on the big screen courtesy of your Apple TV. If you have a great sound system as well, even your music will sound fantastic. Because the Apple TV only has 8GB of on board storage, rather than downloading content, it simply streams them directly from iCloud.
If you've switched computers, added an additional computer, or simply lost a hard drive or corrupted an iTunes Library, there's no more need to panic about your music, movies, or TV shows. You can re-download them again and again.
You view "Not on this computer" to help more easily find the exact content you're looking for.
Once your episode has downloaded, you'll be able to find it under Music, Movies, or TV Shows in the sidebar to the left.
If you still need help with re-downloading apps, games, iBooks, music, TV shows, or music to your iPhone, iPod touch, or iPad, or any other iCloud feature, head on over to our iCloud Forum and ask away!
Ally Kazmucha, Chris Oldroyd, and Gary Mazo contributed major sections of this guide.