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Definition
A passkey is a digital credential that allows a user to sign in without entering a password. It uses public key cryptography and is usually unlocked with a fingerprint, face scan, device PIN, or another local authentication method.

Why it matters
Passkeys matter because they reduce the risks tied to weak, reused, or stolen passwords. They are harder to phish, easier for users to manage, and can make account access more secure across websites, apps, and devices.

Example use case
A user signs in to an online account with Face ID instead of typing a password. Their device confirms their identity and uses the passkey to securely authenticate them with the website.