In the traditional flow, there is just 1 layer of security, that is your password. You enter your password and voila, you can access your account. But as stated above, this process is good but not great. 2-factor authentication (2FA) adds another security layer to the login process, reducing the chances of account hacking. In this, just knowing and entering your password is not enough. This new layer can be anything like an OTP sent to your mobile, an auto-generated code, or biometric verification on a device you own.
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