Microsoft Authenticator is a mobile application designed to enhance security for online accounts. It provides two-factor authentication (2FA) by generating time-based codes or sending push notifications to verify a user's identity when logging in. This extra layer of security helps protect accounts from unauthorized access. The app supports various services, including Microsoft accounts, Google, and Facebook. Users can also store passwords and manage their accounts within the app. By using Microsoft Authenticator, individuals can ensure their sensitive information remains secure while simplifying the login process across multiple platforms.