[[XMPP|Jabber/XMPP]] is a long-standing, widely-used, privacy-focused and open chat protocol.

Unlike private servers, the public XMPP network is and always will be a federated system, which means that like email or the web, anyone on any server can communicate with anyone else without artificial limitations.

For more information, see [[WikiPedia:XMPP]] or https://xmpp.org