A Jabber Client is a software application that allows users to communicate using the XMPP (Extensible Messaging and Presence Protocol) messaging protocol. It enables real-time text messaging, file sharing, and presence information, allowing users to see who is online and available to chat. Jabber clients can be used on various devices, including computers and smartphones. These clients support features like group chats, voice calls, and video conferencing, making them versatile tools for both personal and professional communication. Popular Jabber clients include Pidgin, Gajim, and Spark, each offering unique interfaces and functionalities to enhance user experience.