Microsoft Authenticator is a convenient and secure app that allows you to sign in to your online accounts using multi-factor authentication, passwordless, or password autofill. With multi-factor authentication, you enter your password and then provide an additional way to prove your identity, such as approving a notification or entering a one-time password generated by the app. The app supports various accounts, including non-Microsoft accounts like Facebook, Amazon, Dropbox, and more. Passwordless authentication is another feature offered by Microsoft Authenticator. Instead of using a password, you can use your phone to log in to your Microsoft account. After entering your username, you simply approve the notification sent to your phone and use your fingerprint, face ID, or PIN for added security. This two-step verification process grants you access to Microsoft products and services. Additionally, Microsoft Authenticator can autofill passwords for you. By signing in with your personal Microsoft account, you can sync and autofill passwords saved in the app. This feature is protected by multi-factor authentication, requiring your fingerprint, face ID, or PIN for access. You can also import passwords from other password managers like Google Chrome. For work or school accounts, Microsoft Authenticator allows you to register your device and add your organization's account. This enables seamless and secure access to files, emails, and apps without the need to log in multiple times. The app also supports cert-based authentication, which verifies that the sign-in request is coming from a trusted device. Please note that Microsoft Authenticator may request optional access permissions, such as accessibility service, location, camera, and read access to your storage. These permissions are only required for specific features, and you can still use the app for services that do not require them.