What is two-factor authentication (2FA)?

Two-factor authentication is a security feature that requires two separate proofs of identity before letting you into an account. Usually this means your password plus a code sent to your phone by text message. Even if someone steals your password, they cannot log in without also having your phone.

How do I turn on two-factor authentication?

For your Apple ID: go to Settings > your name > Password & Security > Two-Factor Authentication. For your bank account: log in to your online banking and look for Security Settings or Two-Step Verification. For email: go to your email provider security settings and look for 2-Step Verification.

What Is Two-Factor Authentication?

Imagine your account has a door with two locks. A criminal might pick the first lock (your password) — but they still cannot open the door without the second lock. That is what two-factor authentication (2FA) does.

How it works

You enter your password as usual
The website or app sends a 6-digit code to your phone by text message
You enter that code on the screen
You are logged in — and a criminal with just your password cannot get through

Where to turn it on

Apple ID: Settings → your name → Password & Security → Two-Factor Authentication
Online banking: Log in → Security Settings → Two-Step Verification (name varies by bank)
Gmail or other email: Account Settings → Security → 2-Step Verification

Important: never share the code

If you receive a 2FA code by text that you did NOT request — do not share it with anyone. A scammer calling and asking you to read them the code is trying to hijack your account. Your real bank will never ask for this code over the phone.

Want to learn more?
Module 3: Passwords & Biometrics goes deeper on this topic.
Go to module → All Tips →