Multi-factor authentication is an authentication method in which a computer user is granted access only after successfully presenting two or more pieces of evidence to an authentication mechanism: knowledge, possession, and inherence. Two-factor authentication is a type, or subset, of multi-factor authentication
The first time you log into an account where Multi-Factor Authentication is enabled, you'll be presented with the following instructions:
Download an app that will allow you to do Time-based One-Time Password (TOTP), like Authy.
Scan the QR Code presented or use the manual entry code. Then, type in the Authentication codes provided.