Service location protocol is an ietf standard protocol that is used to discover/advertise services on the network. you can use slp for anything from locating a suitable printer on your floor to discovering what ldap directories are available in your organization.

this package provides the openslp run-time library package that is linked to slp aware applications. this library implements rfc 2614 - an api for service location. unless there is a slp da in the network, you must install the slpd package to be able to advertise the services.