Telegram is a cloud-based instant chatting and texting application software developed and published by Telegram Messenger LLP. This application was released in August 2013. It is available for mobile and desktop both. The most unique and real quality based feature of the app is its security. The app ensures the security of user’s data through end-to-end fully encrypted messaging. The app is said to be the most secure instant messaging app present in the world market right now. Its security features are tested by many researchers, software engineers and cryptography experts and all of them gave enough positive reviews and indications about this app. The user can send text messages, voice messages, can share photos, videos and even any sort of file via this app without any hesitation and security concern. This app comprises of two versions one is open-source with client-side code, and the other is proprietary with server-side code. It is available for MAC OS X, Windows, Linux, Android, iOS, Windows Phone, Ubuntu Touch, etc.