What is two-factor authentication and how does it work?

What is two-factor authentication and how does it work?

Two-factor authentication is a security feature that helps protect your Facebook account in addition to your password. If you set up two-factor authentication, you'll be asked to enter a special login code or confirm your login attempt each time someone tries accessing Facebook from a computer or mobile device we don't recognize. You can also get alerts when someone tries logging in from a computer we don't recognize.

To turn on or manage two-factor authentication:

1. Go to your Security and Login Settings by clicking  in the top-right corner of Facebook and clicking Settings > Security and Login.
2. Scroll down to Use two-factor authentication and click Edit.
3. Choose the authentication method you want to add and follow the on-screen instructions.
4. Click Enable once you've selected and turned on an authentication method.

click here for more