A Relying Party (RPRP A Relying Party (RP) is an application or website that outsources its user authentication function to an IdP.) is an application or website that outsources its user authenticationAuthentication Authentication is the act of determining that a person is who they claim to be. For more information, see our Concepts page. function to an IdPIdP An Identity Provider (IdP) is a software tool or service that offers user authentication as a service. The IdP manages the user's primary authentication credentials and issues assertions derived from those credentials. At UT Austin, the primary IdP used to authenticate the UT EID and EID Password is Enterprise Authentication, which is managed by the IAM Team. For more information, see our Concepts page..