XMPP

eXtensible Messaging and Presence Protocol (XMPP) (formerly known as Jabber) is an open, XML-inspired protocol for near real time, extensible instant messaging (IM) and presence information (a.k.a. buddy lists). The protocol is built to be extensible and other features such as Voice over IP and file transfer signaling have been added.

Protocol

• XMPP Protocol
• XMPP Extensions

Additional Information

• Wikipedia
• XMPP About