Extensible Messaging and Presence Protocol (XMPP)

The Extensible Messaging and Presence Protocol (XMPP) is the IETF standard for instant messaging. It is based on XML and widely supported in the industry, largely thanks to the early introduction as an enterprise solution and working to make the platform completely open.

XMPP supports federation, allowing one enterprise to communicate with another — across enterprise boundaries — without the need for an intermediary or service provider to facilitate communication.

XMPP also supports TLS to provide end-to-end security of messages between users over the Internet.

XMPP was originally created by Jabber, Inc. and was often simply referred to as "Jabber". The company encouraged open source development of XMPP and worked to progress the protocol as a standard in the IETF.