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 abbreviation for Session Announcement Protocol, SAP provides session setup details to users engaged in a multicast session. It often utilizes Session Description Protocol (SDP) as a format for Real-time Transport Protocol (RTP) sessions.