Judo (柔道 ,jūdō?), meaning "gentle way", is a modern Japanese martial art (gendai budō) and combat sport, that originated in Japan in the late nineteenth century. Its most prominent feature is its competitive element, where the object is to either throw one's opponent to the ground, immobilise or otherwise subdue one's opponent with a grappling manoeuvre, or force an opponent to submit by joint locking the elbow or by executing a choke. Strikes and thrusts (by hands and feet) — as well as weapons defences — are a part of judo, but only in pre-arranged forms (kata) and are not allowed in judo competition or free practice (randori).

Judo teaches the principle of flexibility in the application of technique. This is efficient use of balance, leverage, and movement in the performance of Judo throws. Skill, technique and timing, rather than the use of brute strength, are the essential ingredients for success in Judo. For example, in Judo classes you may learn how to give way, rather than use force, to overcome a stronger opponent.

Judo has a strict set of rules that governs competition and ensures safety. For those who want to test their skills, Judo offers the opportunity for competition at all skill levels, from club to national tournaments, to the Olympic Games. Judo is unique in that all age groups, both sexes, and most disabled persons can participate together in learning and practicing the sport. Judo is an inexpensive, year-round activity, that appeals to people from all walks of life.