When someone uses a Google, Facebook, or Apple account to sign in to another application, OpenID Connect helps federate that identity across services. section 2.2.2
OpenID Connect (OIDC) is an authentication and authorization framework that propagates identity attributes in signed tokens. It helps applications and identity providers share consistent identity information across organizational systems. section 3.3.2 section 2.2.2
OpenID Connect contributes to interoperability in two closely related ways:
- Federates identity providers so users can access multiple applications without separate application-specific identities. section 2.2.2
- Propagates identity attributes in signed tokens, helping authentication and authorization decisions use synchronized account information. section 3.3.2
