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Language Foundation

2FA

2FA, or two-factor authentication, is an identity-verification method that requires exactly two authentication factors from different categories.

In plain English

It checks that a person is who they claim to be by asking for two kinds of proof, not just one. The two proofs must come from different categories, so two of the same kind do not meet the requirement.

In context

Here, "2FA" names a sign-in protection option that uses identity verification with exactly two authentication factors from different categories.

Situation
Setting passwords, multifactor authentication, recovery codes, and trusted devices
What it communicates
labels a sign-in protection option on the setup screen

Meaning limits

The term by itself does not say which categories are used or how the two factors are collected.

Examples

“The check was not 2FA because it relied on two proofs of the same kind.”

Core meaning

“During setup, Nadia turned on 2FA for her payroll account.”

In context

  • multifactor authentication Broader Term

    This is the wider category of identity verification that uses more than one authentication factor; 2FA is the case with exactly two.

  • single-factor authentication Contrast

    This uses one authentication factor rather than two from different categories.