What is Facebook’s Two-Factor Authentication?
Facebook’s two-factor authentication (a.k.a Login Approvals) is an added security feature used to help prevent hackers from logging into your account with a stolen password. It helps you prove to Facebook that you are who you say you are. This is done by Facebook determining that you are connecting from a previously unknown device or browser and issuing you an authentication challenge, requiring you to enter a numeric code that generated by using the Code Generator tool from within your smartphone’s Facebook app.
Once you have entered the code you received on your phone, Facebook will allow the login to take place. Hackers (whom hopefully don’t have your smartphone) will not be able to authenticate since they won’t have access to the code (unless they have your phone)
