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Telegram is a cloud-based, instant messaging app. The app was launched for iOS on August 14, 2013. Telegram focuses on speed and security. It features end-to-end encryption for voice calls and optional end-to-end encrypted "secret" chats between two participants, which are not stored on servers. The application's client-side code is open-source software but the source code for recent versions is not always immediately published, whereas its server-side code is closed-source and proprietary.

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