Two-factor authentication makes it difficult for hackers to access online accounts and person’s devices because of its advanced security level. It isn’t sufficient to recognize the victim's password to pass authentication verification. To prevent the data of their users’ from hackers, online services are progressively introducing 2FA. Two-factor authentication is responsible for accessing and controlling the sensitive data and systems.
Once the two-factor authentication is configured, a third field will appear in the login screen:
For more information see the Manual Page.