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Prior to the release of iOS 5, to be able to transfer files between your primary computer and iPhone, you either needed to email that data or directly connect the computer to your iPhone via the supplied USB cable. The iTunes software also needs to be running on your Mac or PC to establish the connection.
Now, with the introduction of Apple’s iCloud service (which you learn more about in Chapter 4, “An Introduction to iCloud”), not only can you easily transfer and share files, documents, data, and content between your iPhone and your primary computer (as well as other iOS devices, including an iPad, iPod touch, and/or Apple TV), you can also wirelessly sync data from apps and wirelessly back up your entire iPhone using iCloud.