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Definition
2FA, or two factor authentication, is a security method that requires users to verify their identity using two different factors, typically something they know, something they have, or something they are.

Why it matters
2FA adds an extra layer of protection beyond passwords, significantly reducing the risk of account compromise from stolen or reused credentials. Even if a password is exposed, unauthorized access is blocked without the second factor.

Example use case
A user logs into an online account with a password and then enters a one time code sent to their phone or generated by an authentication app.