Kyokushin (極真) is Full-Contact or Knock-Down Karate,
a style of stand-up fighting; founded in 1964 by Korean-Japanese Masutatsu "Mas" Oyama. "Kyokushin" is Japanese for "the ultimate truth".
The name Kyokushinkai is composed of the characters:
Kyoku = highest, final
Shin = truth, reality
Kai = union, group
Which translated into something means: "style of highest possible reality".
While in the other styles the show aspect and the optics count and the opponent is not hit with full force; in Kyokushinkai Karate the hit effect is decisive.