Your Apple ID is an account that lets you access all Apple services. Use your Apple ID to download apps from the App Store; access media in Apple Music, Apple Podcasts, Apple TV, and Apple Books; keep your content up to date across devices using iCloud; set up a Family Sharing group; and more.
You can also use your Apple ID to access other apps and websites (see Update account, security, and payment information. In Manage a Family Sharing group on Mac in the macOS User Guide.
Update account, security, and payment information. In Manage a Family Sharing group on Mac in the macOS User Guide.