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Google Talk is Google's free chat and instant messaging application available on multiple platforms, including Android, Mac OS 10.5 or later, Linux, Windows (Server 2003, XP, and later) and Google Chrome OS. Google Talk also provides support for Voice over Internet Protocol (VoIP) or PC-to-PC calls. Mobile platforms, such as Android and BlackBerry, include Google Talk on most compatible devices.
Google Talk is also known as Gtalk.
Launched in August 2005, Google Talk is now used worldwide, primarily because of its easy integration with Google's Gmail platform, facilitating Gmail storage for Google Talk chats and messages.
Google Talk uses the open Extensible Messaging and Presence Protocol (XMPP), which facilitates live messaging and events, including voice mail and offline messaging.
Google Talk's innovative and cross-platform application features are as follows: