When you create an Apple ID, you enter an email address. This email address is your Apple ID and the username that you use to sign in to Apple services like Apple Music and iCloud. Its also the contact email address for your account. Be sure to check your email address regularly.
Can your Apple ID be different than your email address?
If you no longer use the email address thats associated with your Apple ID, you can change it. You wont lose access to your contacts, purchases, or other account information.
What email address can I use for Apple ID?
To use Mail on iCloud.com, go to icloud.com/mail and sign in with your Apple ID. If you have an @icloud.com email address, you can use it to sign in instead of your Apple ID.