Two-Factor Authentication (2FA)
Two-Factor Authentication (2FA) is a security method requiring two authentication factors: something you know (password, PIN), something you have (smartphone, token), or something you are (fingerprint, face ID). It strengthens security by adding an extra layer beyond passwords. Common methods include SMS/email codes, authenticator apps, hardware tokens, and biometrics. While 2FA uses exactly two factors, Multi-Factor Authentication (MFA) can include additional layers. 2FA reduces unauthorized access risks, aids compliance, and enhances account security but may introduce usability challenges.
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