Telegram has also faced criticism for its wide-scale use by the Islamic State terrorist organization (ISIS). Telegram's security has faced scrutiny of concern critics claim that Telegram's security model is undermined by its use of a specially designed encryption protocol that has not been proven to be reliable and secure, and by not enabling secure conversations by default.

In February 2016, Telegram stated that it had 100 million monthly active users, sending 15 billion messages per day. This service also provides APIs to independent developers. The client-side code is open-system software but contains blob binaries, and the source code for the latest versions is not always published immediately, while the server-side code is closed-source and patented. Telegram was developed by Telegram Messenger LLP and supported by Russian entrepreneur Pavel Durov. Telegram also provides optional end-to-end encrypted messaging. Users can send messages and exchange photos, videos, stickers, audio, and other types of files. The Telegram client is available for mobile phone devices (Android, iOS, Windows Phone, Ubuntu Touch) and computer system devices (Windows, OS X, Linux). Download telegram for pc windows 10 64 Bit - Telegram is a free and non-profit cloud-based, multi-platform instant messaging service application.

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