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Definition
FIDO2 is a passwordless authentication standard developed by the FIDO Alliance and W3C. It allows users to verify their identity with public key cryptography through methods such as passkeys, biometrics, device PINs, or hardware security keys.

Why it matters
FIDO2 matters because it reduces reliance on passwords, which are often stolen, reused, or targeted by phishing attacks. It helps create stronger, phishing-resistant login experiences while making sign-in faster and easier for users across supported devices and services.

Example use case
A user logs in to an online account with a passkey saved on their phone. The device confirms the user with Face ID or a fingerprint, then uses FIDO2 to securely authenticate them without sending a password to the website.