Session Description Protocol

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Session Description Protocol (SDP), is a format for describing streaming media initialization parameters. It has been published by the IETF as RFC 4566.

SDP is intended for describing multimedia sessions for the purposes of session announcement, session invitation, and other forms of multimedia session initiation.

SDP started off as a component of the Session Announcement Protocol (SAP), but found other uses in conjunction with RTP, SIP and just as a standalone format for describing multicast sessions.

There are five terms related to SDP:

Conference: It is a set of two or more communicating users along with the software they are using.
Session : Session is the multimedia sender and receiver and the flowing stream of data.
Session Announcement: A session announcement is a mechanism by which a session description is conveyed to users in a proactive fashion, i.e., the session description was not explicitly requested by the user.
Session Advertisement : same as session announcement
Session Description : A well defined format for conveying sufficient information to discover and participate in a multimedia session.