3FA stands for three-factor authentication, a type, or subset, of multifactor authentication.
3FA example – knowledge factor, possession factor, inherent (biometric, for example) factor or in other words – something you have, something you know and something you are.
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Amazon goes on two-factor domain binge after security announcement https://t.co/CEdCOskaDI
— DomainNameWire.com (@DomainNameWire) August 27, 2021