Passkey

A phishing-resistant way to sign in using your device's fingerprint, face or PIN instead of a password or code.

A passkey is a login credential stored on your device or password manager. You unlock it with your fingerprint, face or device PIN.

Passkeys only work on the real website they were created for, so a fake login page can't capture or reuse them. That makes them one of the strongest protections for exchange and email accounts.