Google Talk is an instant messaging service that provides both text and voice communication. The instant messaging service is colloquially known as "gchat" to its users, although Google does not endorse this name.
Google Talk is also the name of the client applications offered by
Google to access the service. Google Talk applications are available for
Microsoft Windows (XP, Server 2003, Vista, and Windows 7), Android, Blackberry, and Google Chrome OS operating systems.
Because the Google Talk servers communicate with clients using an open
protocol, XMPP, the service can also be accessed using any other client
that supports XMPP. Such clients are available for a number of
operating systems not supported by the Google Talk client.
VoIP in Google Talk uses an older version of what became the Jingle
protocol. The technology used within the Google server network, however,
is not publicly known.
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