Microsoft Authenticator for Android is a mobile app that provides a secure way to sign in to your Microsoft accounts and other supported accounts without using passwords. It primarily uses two main methods for authentication :

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Two-factor authentication (2FA) with time-based one-time passwords (TOTP):

This is the most common use. The app generates a six-digit code that changes every 30 seconds. You enter this code along with your username or email address when signing into a service, providing an extra layer of security beyond just a password. This protects you even if someone steals your password.

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Passwordless authentication:

This newer feature allows you to sign in to supported services using biometric authentication (fingerprint or face recognition) or by simply approving a notification on your phone. This eliminates the need to type in any passwords or one-time codes at all.

In short, Microsoft Authenticator acts as a digital key, adding a crucial security element to your online accounts. It[SQ]s particularly useful for protecting accounts with sensitive information, like your email, Microsoft 365, and other Microsoft services. It also supports authenticating to other services that integrate with TOTP, expanding its usability beyond just Microsoft accounts.