Japanese martial arts refer to the variety of martial arts native to the country of Japan. At least three Japanese terms are used interchangeably with the English phrase "Japanese
The usage of term "budō" to mean martial arts is a modern one, and historically the term meant a way of life encompassing physical, spiritual, and moral dimensions with a focus of self-improvement, fulfillment, or personal growth. The terms bujutsu and bugei have more discrete definitions, at least historically speaking. Bujutsu refers specifically to the practical application of martial tactics and techniques in actual combat. Bugei refers to the adaptation or refinement of those tactics and techniques to facilitate systematic instruction and dissemination within a formal learning environment.
The historical origin of Japanese martial arts can be found in the warrior traditions of the samurai and the caste system that restricted the use of weapons by members of the non-warrior classes. Originally, samurai were expected to be proficient in many weapons, as well as unarmed combat, and attain the highest possible mastery of combat skills, for the purpose of glorifying either themselves or their liege.
(source citation en.wikipedia.org )