Ninjutsu is a Japanese martial art that emphasizes resourcefulness, fighting spirit, and practicality, not glory. It is sometimes used interchangeably with the modern term ninpō, and it is the martial art strategy and tactics of unconventional warfare, guerrilla warfare, and espionage purportedly practiced by the ninja. Ninjutsu was developed as a collection of fundamental survivalist techniques in the warring state of feudal Japan, and the ninja used their art to ensure their survival in a time of violent political turmoil.

Ninjutsu includes methods of gathering information and techniques of stealth and entering methods, disguise and impersonation, tactics, espionage, and escaping and concealment. It also involves fighting skills similar to that of many Japanese martial arts with strikes, grappling, ground fighting, locks, chokes, throws, and weapons training.

Many different schools have taught their unique versions of ninjutsu, and an example of this is the Togakure-ryū, which claims to have been developed after a defeated samurai warrior called Daisuke Togakure escaped to the region of Iga. However, records and details of actual period ninja disciplines/techniques were closely guarded, and todays modern Ninjutsu will vary from school to school and will most likely be a watered-down version and/or a take on the original and traditional way and most certainly no longer concentrate on stealth and assassination techniques.

In summary, Ninjutsu is a Japanese martial art that emphasizes resourcefulness, fighting spirit, and practicality, not glory. It includes methods of gathering information, techniques of stealth and entering methods, disguise and impersonation, tactics, espionage, and escaping and concealment. Many different schools have taught their unique versions of ninjutsu, and todays modern Ninjutsu will vary from school to school and will most likely be a watered-down version and/or a take on the original and traditional way.