What Is 2-Step Verification

Two-step verification (also known as Two-factor authentication, abbreviated to TFA) is a process involving two stages to verify the identity of an entity trying to access services in a computer or in a network. This is a special case of a multi-factor authentication which might involve only one of the three authentication factors (a knowledge factor, a possession factor, and an inherence factor) for both steps.[1][2][3] If each step involves a different authentication factor then the two-step authentication is additionally two-factor authentication.