The Microsoft Authenticator app is for those people who use two-step verification to secure their personal or work accounts or for Android and iOS users who want to sign in to their personal Microsoft account without a password.
Two-step verification adds an extra layer of security to your account, and the Microsoft Authenticator app helps to make this a smooth process. When you sign in, the first step is to enter your password (something that only you should know) and the second step is to verify with the app on your phone (something that only you should be able to access).
You can configure your account so that the Microsoft Authenticator app works in one of two modes. One option is for the app to send you a notification whenever you sign in. Approve the notification and you're good to go. The other option is for the app to automatically generate a new verification code every thirty seconds so there's one available anytime you need to sign in. These codes are good even if your device doesn't have cell reception or internet access.
Article ID: 4026727 - Last Review: 2017, നവം 20 - Revision: 4