Multifactor authentication is a way of providing communication between digital services users. THe user is allowed access to an application or website with a password and at least one other mode of identification. The password iself may be lost, or may be obtained by bad actors through illegal data brokers. With multifactor authentication, access to a service is only available with at least one other proof of identity (authenticity factor).
An additional identity factor may be an object (key, card), knowledge unique to the user (PIN), or a biometric characteristic of a user (fingerprint). Multifactor or two-factor authentication (MFA, 2FA) represents the minimum security standard for digital services.