Apple ID (or Apple Account)
An Apple ID (also called an Apple Account) consists of an email address and a password. In some locations, you can use a phone number instead of an email address. See the Apple Support article Use your mobile phone number as your Apple Account primary user name.
Your Apple ID gives you access to download items from the iTunes Store, use Genius, or subscribe to iCloud Music Library and other Apple services. It’s recommended that you use the same Apple ID for all Apple services.
Your purchases are tied to your Apple ID, and can’t be transferred to another Apple ID. If you make purchases on your iPhone, iPad, or another computer, always sign in using the same Apple ID so you can see all of your store purchases on this computer and download any available updates.
To learn more about Apple ID, see the Apple Account Support website. To create one, go to the Apple Account website, or set one up using iTunes.