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An authenticator app is a software application used to generate one-time passwords (OTPs) or time-based one-time passwords (TOTPs) for multi-factor authentication. These apps are designed to enhance security by requiring users to provide a second form of verification in addition to their password. The OTP generated by the app is typically valid for a short period, making it difficult for unauthorized individuals to gain access even if they manage to steal a user's password.

Commonly used authenticator apps include Google Authenticator, Microsoft Authenticator, Authy, and Duo Mobile. These applications are available for most major mobile operating systems, such as Android and iOS. Once an account is linked to an authenticator app, it will periodically display a new code that the user must enter during the login process. This process adds a significant layer of security compared to single-factor authentication, which relies solely on a password.

The setup process typically involves scanning a QR code provided by the service or website you wish to secure. This QR code contains the necessary information to generate the correct OTPs for that specific account. Users can usually link multiple accounts to a single authenticator app, making it a convenient way to manage security across various online services. The advantage of using an authenticator app over SMS-based OTPs is that it is not reliant on cellular network reception and is generally considered more resistant to SIM-swapping attacks.