There are many forms of Kung Fu, such as Shaolin Kung Fu, Wing Chun, Tai chi, etc., and they are practiced all over the world. Each form of Kung Fu has its own principles and techniques, but is best known for its trickery and quickness, which is where the word Kung Fu is derived. It is only in the late twentieth century that this term was used in relation to Chinese martial arts by the Chinese community.
In China, it refers to any study, learning, or practice that requires patience, energy, and time to complete. In its original meaning, Kung Fu can refer to any discipline or skill achieved through hard work and practice, not necessarily martial arts (for example, the discipline of tea making is called the Gongfu tea ceremony).