Two-factor authentication (2FA), also known as two-step verification, is a widely-implemented method of adding an extra layer of security to your accounts and services after you have submitted a password.
The most common methods are via an SMS message, a biometric marker such as a fingerprint or iris scan, a PIN number, pattern, or physical fob. Using 2FA creates an additional step to access your accounts and data, and while not foolproof, can help protect your accounts -- and password vaults, too.
How to enable 2FA: Facebook | Twitter | Instagram | Snapchat | Apple | Google | Microsoft
For an in-depth guide to implementing 2FA, check out ZDNet's Ed Bott's explainer.
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