macOS High Sierra

What is an Apple ID?

An Apple ID gives you access to the iCloud, iTunes Store, iBooks Store, App Store, FaceTime, and other Apple services. It consists of an email address (for example, emilyparker@icloud.com) and a password. For more information about Apple ID, or to create one, go to the Apple ID acccount website.

You can have more than one Apple ID. How