Two-factor authentication is a mechanism that allows users to verify an attempt to authenticate. The user must provide a one-time code to confirm authentication that is sent to their device. This code is sent, for example, via text message or generated by a code via an app such as Microsoft Authenticator on a smartphone.

the Multi-factor authentication ( MFA ), also known as multifactor authentication, is a generalization of the Two-factor authentication , in which the access authorization is checked by several independent characteristics (factors)