security en
Multi-factor authentication
security
Also called: MFA
Plain-language definition
Plain-language definition
Sign-in that requires more than one different type of proof.
Why it matters
MFA reduces the chance that one stolen credential is enough to take over an account.
Technical detail
Multi-factor authentication combines distinct factor types such as knowledge, possession, or inherence; two passwords are still one factor type.
Examples
- A user enters a password and then approves a code from an authenticator app.
Related terms
Sources and review
Reviewed July 12, 2026 by [email protected]. Next review due January 11, 2027.
- Digital Identity Guidelines Glossary — National Institute of Standards and Technology Accessed 7/11/2026
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