SAP may refer to any of the following:
1. Short for service advertising protocol, SAP is used by servers to inform clients of availability on the network in a Novell NetWare environment. SAP messages are broadcasted every 60 seconds. If a SAP packet is not received for three minutes, that server is presumed down.
2. An acronym for Session Announcement Protocol, SAP provides session setup details to users engaged in a multicast session. It often utilizes SDP (Session Description Protocol) as a format for RTP (Real-time Transport Protocol) sessions.