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Also known as "2 Factor Authentication" or more simply "2FA" as 2FA, two step verification or TFA (as an acronym) is an extra layer of security that requires, in addition to your regular username and password, a separate piece of information that only you can access.  This can be a code received on your mobile device or a unique piece of hardware.  This limits the effectiveness of simple password hacks and social engineering exploits.

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