An Apple ID (aka an iTunes account) is one of the most versatile and useful things you can have if you own an iPod, iPhone, or iPad. With one, you can buy songs, apps, or movies at iTunes, set up and use iOS devices, use FaceTime, iMessage, iCloud, iTunes Match, Find My iPhone and much more.
ITunes accounts are free and are simple to set up. To create an iTunes account, launch the iTunes program and click on the iTunes Store button in the top right corner.
The iTunes Store will load. In the top left corner, you'll see a button that reads Sign In. Click it to begin the process of creating an Apple ID.