Google Talk is a computer application for Voice over IP and instant messaging, offered by Google. The first beta version of the program was released on August 24, 2005.
The Google Talk client is currently only available for Windows (2000, XP, Server 2003, and Vista), but with the release of the Google Talk gadget, a user on any operating system with a web browser can use Google Talk. Other XMPP clients, like Pidgin, do however support other operating systems. Check the list of Jabber client software for compatible software.
Instant messaging between the Google Talk servers and its clients uses an open protocol, XMPP, allowing users of other XMPP clients to communicate with Google Talk users. VoIP in Google Talk is based around the Jingle protocol. The technology used within the Google server network however is not publicly known.
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