The Tor network is a group of volunteer-operated servers (relays) that allows people to improve their privacy and security on the Internet. Tor’s users employ this network by connecting through a series of virtual tunnels rather than making a direct connection, thus allowing both organizations and individuals to share information over public networks without compromising their privacy.
(via Boing Boing)
See also: Drone strikes: an infographic; Edward Snowden on freedom; ‘1984’ stealth fashion for the under-surveillance society; Paranoid Android: Silent Circle’s Blackphone 2.