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Ninjutsu is a real-life form of martial art centered around unconventional warfare and espionage that is purportedly practiced by the shinobi (commonly known outside of Japan as ninja).
Ninjutsu (忍術?) (sometimes used interchangeably with the more modern term ninpō (忍法 ninpou?)) was regarded more as an art of tricks than a martial art. Ninjutsu was a different discipline in some traditional Japanese schools, which integrated study of more conventional martial arts along with shurikenjutsu, kenjutsu, sōjutsu, bōjutsu, and battlefield grappling kumi-uchi (an old form of jujutsu) among other practitions.