Telegram www.telegramdw.com (informally abbreviated as TG, Telegram, Paper Plane) is cross-platform instant messaging software whose client is free and open source software, but whose server is proprietary. Users can exchange encrypted and self-destructing messages with each other, send photos, films and all other types of files. It provides clients for mobile phones (Android, iOS, Windows Phone), desktops (Windows, macOS, Linux), and web pages; it also has an open API, so there are many third-party clients to choose from.