Jeet Kune Do, or JKD, is a fighting style founded in 1967 by Bruce Lee. He referred to it as “non-classical”, suggesting that it is a type of Chinese Kung Fu without form. It was named for the Wing Chun concept of interception or attacking while one’s opponent is about to attack.
Lee believed real combat was spontaneous and unpredicactable, and that a good martial artist should “be like water” – taking whatever shape necessary, and moving fluidly without hesitation.
Therefore JKD is not fixed or patterned. Its core hallmarks are minimal movement, maximum effect, and extreme speed, with the martial artist adapting to situation by smoothly flowing between the “tools” of kicking, punching, trapping, and grappling.
In the screenplay of the 1973 Warner Brothers film, Enter the Dragon, Lee is asked; “What’s your style?” Lee replied, “My style?…You can call it the art of fighting without fighting.”
(Wikipedia, https://en.wikipedia.org/wiki/Jeet_Kune_Do)