https://www.sciencedaily.com/releases/2020/06/200629124054.htm

SSO schemes give users the option to access multiple systems by signing in to just one specific system. This specific system is called the "identity provider" and is regarded as a trusted entity that can verify and store the identity of the user. When the user attempts to access a service via the SSO, the "service provider" asks this identity provider to authenticate the user.

The advantages of SSO systems are many. For one, users need not remember several username and password combinations for each website or application. This translates into fewer people forgetting their passwords and, in turn, fewer telephone calls to IT support centers. Moreover, SSO reduces the hassle of logging in, which can, for example, encourage employees to use their company's security-oriented tools for tasks such as secure file transfer.