What is Single Sign-on?
Single sign-on (SSO) is an authentication process that allows a user to access multiple applications with one set of login credentials. SSO is a common procedure in enterprises, where a client accesses multiple resources connected to a local area network (LAN). (source: https://www.techopedia.com/definition/4106/single-sign-on-sso)
Essentially, this allows you to only have to login with your SSO platform and use that login on different sites or applications that support SSO.