OpenID Connect 1.0 (OIDCOIDC OpenID Connect 1.0 (OIDC) is an authentication layer built on OAuth 2.0 where the identity provider that runs the authorization server also holds the protected resource that the third-party application aims to access.) is an authenticationAuthentication Authentication is the act of determining that a person is who they claim to be. For more information, see our Concepts page. layer built on OAuth 2.0 where the identity provider that runs the authorizationAuthorization Authorization refers to the act of determining whether an authenticated user is allowed to access a specific resource or take a specific action. For more information, see our Concepts page. server also holds the protected resource that the third-party application aims to access.