Two-factor authentication is designed to make sure that you're the only person who can access your account. Learn how it works and how to turn on two-factor authentication.| Apple Support
An account recovery contact can help make sure that you always have access to your account, even if you forgot your Apple Account password or device passcode. Learn how to set up a recovery contact on your iPhone, iPad, or Mac.| Apple Support
Learn how security is implemented in Apple hardware, software, apps, and services.| Apple Support