Grandmaster (martial arts) of "Dan" rankings and Black belt and Red belt in martial arts both derive from Judo where they were adopted by its founder Kanō Jigorō. There are many terms similar or equivalent to 'grandmaster' used by various martial arts traditions. Some of these terms derive from older systems, while others are relatively modern. Japanese martial arts commonly use Sensei (先生) meaning "teacher" or literally translated, "born first" or "one who has gone before". A "Sensei" is a person who has knowledge and is willing to teach that knowledge to another. A "Sensei" assists students in "ken shiki" "the pursuit of
Japanese martial arts include marine skills such as swimming and river-fording ("suijutsu"), equestrianism ("bajutsu"), arson and demolition ("kajutsu"). , literally meaning "modern martial way", usually applies to arts founded after the beginning of the Meiji Restoration in 1868. Aikido and judo are examples of "gendai budō" that were founded in the modern era, while "iaidō" represents the modernization of a practice that has existed for centuries. The core difference is, as was explained under ""koryū"", above, that "koryū" arts are practiced as they were when their primary utility was for use in warfare, while the primary purpose of "gendai budō" is for self-improvement,