"The gentle way." Olympic sport and martial art.
Judo is a grappling martial art. Like wrestling with a more upright focus where opponents are thrown down or legs are swept out to take a person to the ground. Classes are taught in drilling and freestyle sparring. Students test each other to refine techniques to the most efficient moves possible regardless of size or strength.
Judo is a dynamic combat sport that demands both physical prowess and great mental discipline. From a standing position, it involves techniques that allow you to lift and throw your opponents onto their backs.
Ground tactics include techniques that allow you to pin your opponents down to the ground, control them, and apply various chokeholds or joint locks until submission.
The true origins of Japan's martial arts are not well defined. Many consider the takenouchi-ryu martial art system founded in 1532 to be the the origin of Japan's jujitsu forms. By the 1800's more than 700 different jujitsu systems existed.
In the 1850's America forced open the closed society of Japan. The military ways of Japan went into a rapid alteration as the country modernized.
Jujitsu became less common as schools simply died out. A physician name Jigoro Kano had been a student of multiple disciplines of Jujitsu. He took this training and molded it into a system of physical education and sport while preserving the core combative art. In the late 1800's Dr. Jigoro Kano called his new style Judo.