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RSVP - technical definition

In the TCP/IP protocol suite, a Transport Layer (Layer 4) control protocol that operates on a hop-by-hop basis in order to signal quality of service (QoS) requirements for unicast and multicast data flows to each node and, thereby, reserve the necessary per-session resources from end-to-end across an Internet Protocol (IP) network. RSVP can operate in conjunction with other QoS protocols, including DiffServ and MPLS, to effect service discrimination. See also DiffServ, hop, IP, MPLS, multicast, node, protocol, protocol suite, QoS, session, TCP/IP, Transport Layer, and unicast.

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(ReSerVation Protocol) A communications protocol that signals a router to reserve bandwidth for real-time transmission. RSVP is designed to clear a path for audio and video traffic, eliminating annoying skips and hesitations. It has been sanctioned by the IETF, because audio and video traffic is constantly increasing on the Internet. See RTP and COPS.