A clear two-factor authentication definition is a security method that requires two separate forms of verification before granting access to an account. It strengthens password protection by adding an additional layer designed to prevent unauthorized entry.
These verification factors may include something the user knows, possesses, or physically is, such as a password, smartphone code, or fingerprint. Even if a password is compromised, two-factor authentication can significantly reduce account security risks.
Two-factor authentication (2FA) is a security method that requires two different forms of verification before granting access to an account, device, or service. This approach provides an additional layer of protection beyond a password.
The two factors usually come from separate categories: something you know, such as a password; something you have, such as a smartphone or security key; or something you are, such as a fingerprint or facial feature.
For example, a user may enter a password and then confirm a temporary code sent through an authenticator app. Since the second factor is separate from the password, a stolen password alone may not be enough to access the account.
The two-factor authentication definition specifically refers to using two verification factors, rather than simply completing two security steps. Methods such as authenticator apps, hardware security keys, and biometric verification can support 2FA, depending on the service.