"define multi-factor authentication"

What is multi-factor authentication?

Multi-factor authentication is also called two-factor authentication (2FA) or two-step login.

Multi-factor authentication improves the security of username-password logins by asking the user to give additional proof of their right to access the service, the first being knowledge of the correct username-password.

For example, your bank account may ask you to show a temporary code sent to your email address, proving that you not only know the username-password but that you also have access to an email linked to your bank profile.


Glossary
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