This is one of the authentication methods to enhance account security. It is a mechanism that prevents unauthorized access by requiring an additional authentication method in addition to the usual password.
Two-factor authentication uses the following two factors to authenticate:
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Knowledge factor (Something you know)
Example: Password, etc.
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Possession factor (Something you have)
Example: Verification code sent to your smartphone, authenticator app, etc.
As a result, even if your password is compromised, unauthorized access is harder to achieve because a second authentication method is required.
How to set up two-factor authentication: