Judo is a modern Japanese martial art and combat sport created in Japan in 1882 by Dr Kano Jigoro. The idea is to throw your opponent on their back, pin them or subdue them using joint locks and pins.
Kano created the combat sport of Judo so that the martial art could be practised at full force whilst maintaining the safety of the fighters. Because of this, Judo is considered to be one of the most effective martial arts for self defence. It encourages hard work and self discipline, the only way to become successful is through practice and regular training. For this reason it is also perfect for children and being an Olympic sport, there is a solid infrastructure to help kids become World Champions. It is also ideally suited to the modern sport of MMA as it concentrates on take downs and ground work.