AI & the web
Two-factor authentication
Signing in using two different types of evidence of identity.
In everyday use
An account requires a password and a code from an authenticator app.
What to keep in mind
Keep recovery options safe; not all second factors offer the same protection.
Also searched as: 2FA, multi-factor authentication, MFA
Further reading
Original explanation and example by Perspectism. Further reading may cover the wider subject, rather than this exact wording. Edition updated 7 October 2026.
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