# Two-factor authentication
> Two-factor authentication adds a second proof of identity beyond your password.
Topics: Apps, Security
Difficulty: Everyday
Aliases: 2FA, MFA, two-step verification
Updated: 2026-06-26T08:00:00.000Z
## Go deeper
Two-factor authentication adds a second proof of identity beyond your password. In everyday buying decisions, the useful question is not just what the spec says, but what it changes for comfort, cost, speed, safety, or battery life.