What does Single Sign-On (SSO) enable a user to do?

Single Sign-On (SSO) is a user authentication process that allows users to access multiple applications and services with a single set of credentials, such as a username and password. This is particularly beneficial in environments where a user needs to access numerous systems, as it simplifies the user experience by reducing the need to remember and enter different authentication details for each application.

The core functionality of SSO revolves around the idea of using one authenticator for various resources. When a user logs in once using their primary credentials, they gain access to all connected applications and services without needing to log in again for each one, enhancing both usability and efficiency.

The other options either misinterpret the functionality of SSO or describe features unrelated to its core purpose. For instance, while SSO may facilitate multiple sessions, it does not inherently authenticate them simultaneously. Accessing systems without any authentication contradicts the fundamental purpose of identity verification. Lastly, employing whitelisting for applications pertains to security measures for controlling access rather than how SSO enables user authentication.