Judo is an Olympic sport from Japan that has been part of the Summer Olympics since 1964. It is a martial art that focuses on grappling and throwing techniques, and is practiced by millions of people around the world. Judo is derived from jujutsu, a traditional Japanese martial art, and was created in 1882 by Jigoro Kano. It is now one of the most popular sports in Japan and is also practiced in many other countries.