What is a key feature of single sign-on (SSO) systems?

A key feature of single sign-on (SSO) systems is that they allow users to authenticate with a single set of credentials, typically a username and a password, which grants them access to multiple applications or services. This approach simplifies the user experience by reducing the number of usernames and passwords needed to access different systems, thus making it easier to remember and manage login information.

The use of a single password streamlines the authentication process, enhancing both convenience for users and administrative efficiency for managing access. As users only have to remember one password, this can also lead to improved security practices, such as allowing for stronger password policies since there's one less username and password combination to manage.

In contrast, requiring multiple usernames or unique passwords for each application would contradict the basic purpose of SSO by complicating the login process. Additionally, while two-factor verification may enhance security, it is not a defining characteristic of SSO, as SSO primarily focuses on credential consolidation for ease of access rather than on the security protocols applied to the login process.