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The document provides an overview of XMPP (eXtensible Messaging and Presence Protocol), formerly known as Jabber. It discusses that XMPP is an open standard for real-time messaging that routes small snippets of XML between servers to allow users like Alice and Sister to exchange messages and presence information in real-time. The document also covers the history and development of XMPP, its architecture and decentralized federated model, encryption and security features, common uses like instant messaging and voice/video calling, and extensible capabilities through extensions.









































































































































































































































































