OpenID Connect is a new Single Sign On protocol, built on top of OAuth 2.0. Led by OpenID foundation, he very different form OpenID 1.0 and OpenID 2.0, now marked as obsoletes. This paper will let you discover this new standard, by first explaining what is OAuth 2.0 and why it is not an identity protocol. Then the OpenID Connect protocol will be described, and to conclude, we will do a comparison with the other main SSO standard which is SAML.