Ninjitsu originated in the ninth century and flourished throughout the history of Japan, but especially so around the beginning of the 15th century. The style is Japanese but it was influenced by Chinese methods.
Because of their function, the ninja developed martial techniques with minimal equipment and developed a wide variety of skills.
Because of their skills, legend gives the ninja magical powers. In many ways they were the exact opposite of the samurai. Ninjas did not stop at arson, sabotage, or assassination. The practice was banned in the 17th century but in recent years, interest in ninjitsu techniques has revived.