Glossary term
Two-factor authentication
A second identity check used alongside a password when signing in.
Abbreviation: 2FAReviewed 1 July 2026
Definition
A sign-in method that requires two different forms of verification.
In plain English
After entering a password, you confirm it is really you in another way, such as with an authentication app.
Why it matters
The second check can make an account harder to access with a stolen password alone.