Jabber is a free instant messaging service based on the Extensible Messaging and Presence Protocol (XMPP).
Known as the original instant messaging service, Jabber.org launched in 1999 and offered free XMPP accounts to users. The service took its name from ‘Jabber’ the original name given to the XMPP communications protocol.
The XMPP protocol was developed by an open-source community and enabled near real-time instant messaging, presence information and contact list maintenance. Unlike most messaging services, XMPP is defined as an open standard and uses an open systems approach of development and application – this means that anyone can take the XMPP service and interoperate it with other organisations’ implementations.
Designed to be extensible – meaning it took future growth into consideration – Jabber has also been used for gaming and IoT applications like the Smart Grid.