# The Shibboleth Discovery Service

The Discovery Service allows users to select a home IdP when they first approach a Service provider.

This implementation provides support for two protocols. Firstly there is legacy support for the old style Shibboleth 1.3 prorocol (WAYF) in which the wayf sits between the Sp and the IdP. It also supports the SAML2 DiscoveryService protocol which is a conversation between the SP and the DS. The SP then dispatches off to the IdP.