[Jenk]

SSO can be both Single Sign-On, or Same Sign-On.

The latter is the LDAP integrated thing - (re)using the same credentials for multiple/disparate services, controlled centrally.

The former ("true" single sign-on) is logging in once and accessing everything from there.

FWIW there are single sign-on services out there. Okta is used by my current employer, I log into the Okta portal and it has links out to all of the services it supports from there.