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Unlike most instant messaging protocols, XMPP is defined in an open standard and uses an open systems approach of development and application, by which anyone may implement an XMPP service and interoperate with other organizations' implementations.
Because XMPP is an open protocol, implementations can be developed using any software license; although many server, client, and library implementations are distributed as free and open-source software, numerous freeware and commercial software implementations also exist.
JIDs without a username part are also valid, and may be used for system messages and control of special features on the server.
A resource remains optional for these JIDs as well.
For example, the full JID of a user's mobile account could be will go only to the mobile client.
The highest priority is the one with largest numerical value.
In August 2005, Google introduced Google Talk, a combination Vo IP and IM system that uses XMPP for instant messaging and as a base for a voice and file transfer signaling protocol called Jingle.
Some confusion often arises on this point as there is a public XMPP server being run at , to which a large number of users subscribe.The XMPP network uses a client–server architecture; clients do not talk directly to one another.The model is decentralized - anyone can run a server.The early Jabber community focused on open-source software, mainly the jabberd server, but its major outcome proved to be the development of the XMPP protocol.The early Jabber protocol, as developed in 19, formed the basis for XMPP as published in RFC 3920 and RFC 3921 (the primary changes during formalization by the IETF's XMPP Working Group were the addition of TLS for channel encryption and SASL for authentication).