Single-sign-on (SSO) is an authentication process that allows a user to access multiple applications with one set of login credentials. This is particularly useful in an environment where employees need to access a variety of systems and applications, as it simplifies the user experience and reduces the need for multiple passwords. SSO is designed to alleviate the administrative burden of managing multiple sets of credentials and to improve security by reducing the likelihood of password fatigue, which can lead to weak password practices.

References: The concept of SSO is covered in the Certified Network Defender (CND) course, which includes understanding various types of authentication methods. SSO is mentioned as a type of authentication that allows users to be authenticated once and gain access to multiple systems without being prompted to log in again for each system1.