The code on the authenticator app is synchronized with a server and changes every 30 seconds. Even if someone steals or guesses your password, without the code displayed on your authenticator app that person will not be able to login to your account. Entering the security code displayed on the authenticator app will give you access to your online account (Gmail, Office 365, Dropbox, Facebook, etc.). When you log in to your online account and enter your username and password, you will be prompted for the security code from your authenticator app on your mobile device. For example, you can install an authenticator app on your mobile device for enhanced security. Authenticator apps are applications that are commonly used for multi-factor authentication (MFA) and multi-step authentication to provide an additional level of security for your online sites.
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