Short answer
2FA protects accounts by requiring an extra factor, such as an app code or security key.
Why 2FA helps
If the password leaks, the attacker still needs the second factor. This stops many account takeovers.
Different methods
Authenticator apps and security keys are often stronger than SMS. SMS is still better than no extra protection.
Save recovery codes
When enabling 2FA you often receive recovery codes. Store them safely so you do not lock yourself out.
Common questions
Is 2FA annoying?
It is an extra step, but often only on new devices or risky sign-ins.
Which 2FA is best?
Security keys are strong, and authenticator apps are a good choice for most people.