A cloud authenticator is a remote authentication service that securely manages and verifies user credentials and authentication keys across multiple devices and platforms. Instead of storing sensitive authentication data locally on a device, a cloud authenticator centralizes this information in a secure cloud environment. This approach enhances security by reducing the risk of credential theft from lost or compromised devices and enables seamless multi-device access. Cloud authenticators often support multi-factor authentication (MFA), single sign-on (SSO), and integration with various applications and services. They are widely used in enterprise environments to streamline identity and access management while ensuring robust protection against unauthorized access.