What Is Passwordless Authentication?

Passwordless authentication verifies a user without a shared secret they have to remember. Instead of a password, the user proves identity with something they have (a device or security key) and something they are (a biometric) or know (a local PIN). Done well, it is both more secure and easier than passwords.

Why move off passwords

Passwords are the largest single source of breaches through reuse, phishing, credential stuffing, and password spraying. Removing the shared secret removes the thing attackers steal.

The passwordless spectrum

Not all passwordless is equal:

• Phishing-resistant: passkeys and FIDO2 security keys, bound to the origin and impossible to replay. The gold standard.
• Better than passwords but phishable: magic links and email or SMS one-time codes.

Aim for phishing-resistant MFA where it matters.

Practical considerations

Plan for enrollment and account recovery, the steps attackers target once passwords are gone. Support more than one authenticator per user, and have a tested fallback.

Where to start

Read Passkeys 101 and browse MFA and passwordless vendors.