Ninja clans were secretive groups in feudal Japan, known for their skills in espionage, sabotage, and guerrilla warfare. These clans, such as the Iga and Koga, trained their members in various martial arts, stealth techniques, and the use of specialized weapons. Their primary role was to gather intelligence and carry out covert operations for samurai lords. The members of ninja clans, called shinobi, often operated in the shadows, using disguises and deception to achieve their goals. While popular culture often romanticizes ninjas, historical accounts suggest they were pragmatic fighters who played crucial roles in the political landscape of their time.