Using the Extensible Messaging and Presence Protocol (XMPP), Google Talk is an instant messaging and voice over IP application that allows users with a Google account to text and video chat from within their browser.

The web app is called . It can be found in if users have set the old chat instead of .

From Goodbye to the Google Talk app for Windows - Talk Help

The Google Talk app for Windows was shut down on February 23, 2015. If you try to use the Google Talk app, you'll see a sign-in error, and we'll send you an email explaining what's happened.

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