WingTsun Kung Fu is traditionally called Wing Chun and the name was changed by Great Grand Master Leung Ting to differentiate his system from others.
The main objective of Wing Tsun (or WT as it is commonly abbreviated) is to be a realistic system of self-defense. WT does not focus on fighting “techniques”, instead relying on fighting and energy principles to be followed at all times. The central idea is that, under pressure, it is impossible to visually recognize the precise direction and speed of an attack and make a conscious decision on an effective way in which to react, all within the very brief amount of time you have before your opponent’s attack lands. Rather, one must (counter) attack immediately in a very direct and protected manner and rely on reflexes to determine how to react if the opponent’s attack continues to pose a problem. Chi Sao or “sticking hands” trains students to respond reflexively to the speed, force, and direction of an attack, based on tactile information – which the human brain processes much faster than visual information.
The main difference between Wing Tsun and other Wing Chun styles is the WT teaching method. The style’s creator Leung Ting developed the system to be easier to learn and teach compared to more traditional styles of Wing Chun. This idea was later expanded upon by Grand Master Keith Kernspecht in Germany by introducing many of the WT specific forms (like the leg forms). In comparison to other styles WT has a much more modern, academic style of teaching.