Ninjas, or Shinobi, were covert agents in feudal Japan known for their skills in espionage, sabotage, guerrilla warfare, and assassination. They utilized a variety of techniques, including stealth and deception, to achieve their objectives, often operating in the shadows to gather intelligence or eliminate targets. The art of Ninjutsu encompasses various disciplines, including combat skills, survival tactics, and the use of specialized tools. Ninjas have become iconic figures in popular culture, often depicted in movies, video games, and literature, symbolizing agility, cunning, and mastery of martial arts.