Multi-factor authentication means it uses more than 1 type of authentication. The factors are something the user IS (bio-metric), user knows (knowledge), and user has (physical token).
Multi-factor authentication (MFA) is a method of confirming a user's claimed identity in which a user is granted access only after successfully presenting 2 or more pieces of evidence (or factors) to an authentication mechanism: knowledge (something they and only they know), possession (something they and only they have), and inherence (something they and only they are).
Two-factor authentication (also known as 2FA) is a type (subset) of multi-factor authentication. It is a method of confirming …