Whonix is a desktop operating system designed for advanced security and privacy. It realistically addresses attacks while maintaining usability. It makes online anonymity possible via fail-safe, automatic, and desktop-wide use of the Tor network. A heavily reconfigured Debian base is run inside multiple virtual machines, providing a substantial layer of protection from malware and IP leaks. Pre-installed applications, pre-configured with safe defaults are ready for use. Additionally, installing custom applications or personalizing the desktop will in no way jeopardize the user. Whonix is the only actively developed OS designed to be run inside a VM and paired with Tor.