What Is Two-Factor Authentication?

Two-factor authentication (2FA) requires two different types of verification before granting account access: typically something you know (a password) and something you have (a code, device, or biometric).

Why 2FA Matters

Even if an attacker obtains your password through a data breach or phishing attempt, 2FA can prevent them from accessing your account without the second factor.

Common Types of 2FA

  • Authenticator apps — generate time-based one-time codes on your device.
  • SMS codes — sent via text message (convenient, but less secure than app-based codes).
  • Hardware security keys — physical devices that provide strong, phishing-resistant authentication.
  • Biometrics — fingerprint or face recognition, often combined with a device PIN.

Prefer authenticator apps or hardware keys over SMS when a service offers the choice — SMS can be intercepted through SIM-swapping attacks.

Setting Up 2FA Safely

  1. Enable 2FA on your email account first — it is often the recovery method for other accounts.
  2. Store backup codes somewhere safe and offline.
  3. Use an authenticator app rather than relying solely on SMS where possible.
  4. Register a backup method in case you lose access to your primary device.

Addressing Common Concerns

Some people avoid 2FA because it feels inconvenient. In practice, the extra few seconds at login provide a significant increase in account security and are well worth the tradeoff.