Google talk (GTalk) is a instance message client and voice over IP client provided by Google. GTalk uses an open protocal called XMPP that allowes for other XMPP instance message clients to communicate with Google’s GTalk network. XMPP is the same protocal that Jabber is based off so any Jabber client should be able to communicant with Google’s GTalk network and client. In December 2005 Google purchased 5% of AOL and announced that in the future AIM users and GTalk users will be able to communicate with each other. Google and Skype are also exploring interoperability via the open protocol.
Basically it is a instance message client that works on an open protocol.
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