An American martial art philosophy invented by Bruce Lee. JKD takes what is useful and assimilates it into it's arsenal. Of the martial arts, it is the least restrictive. Any one who practices JKD in the same way as Bruce Lee is doing it wrong, it is intended as a way of personal expression. Truely an American idea, it has no set techniques.
I'm tired and probably screwed this up, read the Tao of Jeet Kune Do by: Bruce Lee for the full scoop.