Short for Session Description Protocol
, a protocol
that defines a text-based format for describing streaming
media sessions and multicast
transmissions. SDP is not a transport protocol but a method of describing the details of the transmission. For example, an SDP file contains information about the format, timing and authorship of the transmission, name and purpose of the session, any media, protocols or codec
formats, the version number, contact information and broadcast times.
In addition to being transport protocols, RTSP and Session Initiated Protocol also rely on SDP.