Jeet Kune Do is an "eclectic martial arts philosophy" conceived and practiced by martial artist Bruce Lee during his lifetime. It was formed from Lee's experiences in unarmed fighting and self-defense, as well as philosophical influence from Eclecticism, Zen Buddhism and Taoism, to serve as a new field of martial arts thought.

Jeet Kune Do was conceived as kind of "intelligent martial art", not only in terms of fighting methods, as it aims to make the human body learn as much as possible, as if it becomes fluid "like water", and everything in the art follows that principle.

The core of Jeet Kune Do mentality is aimed at "intercepting" the opponent, the action or idea of wanting to "strike" the incoming attack itself. It is a set of principles to help the practitioner to make instant judgments and decisions, to improve the self of physical and on a mental level, as well as to make corresponding action responses or counterattacks.

Significant feature of Jeet Kune Do is that it focuses on "practical application in life" and discards the routines and metaphysics of traditional martial arts. Its fighting skills have absorbed and integrated some practical martial arts of the world, with martial arts such as Boxing, Wing Chun, Fencing and Jujutsu serving as the technical backbone of Jeet Kune Do.

Since Bruce Lee himself never truly formalized Jeet Kune Do before he died, the Jeet Kune Do taught by later generations may deviate from his original intent. Regardless, all of the Jeet Kune Do schools still independently continue to interpret the mode of self-knowledge in accordance with the basic martial arts philosophy created by Bruce Lee.