2FA or two-factor authentication is when you protect your account with two factors or locks, creating an additional layer of security.
In this context, a factor is split into three different categories:
Users knowledge (Password)
Something the user owns (Phone)
Biometric traits (Fingerprint)
To be properly protected by 2FA your account must require 2 locks before granting access. The two main factors for AOFEX is a password as well as either an SMS or Google authentication code.
There are endless methods of hacking and circumventing password authentication through means of phishing or public WiFi, so having two-factor authentication enabled is essential to your account security.