Where did ninjitsu originate?

Ninjutsu originated in Japan, specifically during the feudal era, with roots in the Iga and Koga regions. It was developed as a form of covert warfare, emphasizing stealth, espionage, and unconventional tactics. Practiced by the shinobi or ninjas, ninjutsu encompassed various skills, including Martial Arts, survival, and strategy, to serve samurai and other feudal lords.