Ju Jitsu is an ancient Japanese martial art and close combat fighting system. It was one of the many arts a samurai would study and was useful when one had no weapon, it is principally involved in grappling although traditionally certain strikes were taught as well.
"Ju" is often translated as "gentle, supple or yielding." "Jutsu" translates to "art" or "technique". Ju Jitsu, like a lot of arts, uses the principle of using an opponents force against him and simply redirecting it.
However, since striking an armored opponent proved not quite as effective, practitioners shifted to methods for neutralizing enemies with pins, joint locks, and throws.
While Jujitsu can be great in one on one or controlled matches, it offers one great tactical weakness. If you must deal with multiple opponents, you are seriously exposed if you get entangled with one of them and the other assailants will be able to attack you at will however they choose.
Too much emphasis these days is placed on chokes, for effective combat practitioners should concentrate on joint locks that allow them to instantly break arms, or other bones: and on throws, especially those that will land opponents on their head and render them unconscious.
There are many variations of the art, which leads to a diversity of approaches. Jujitsu is currently going through a great dilution because of the MMA sporting events. A word of caution in choosing a Jujitsu instructor, don't choose someone who teaches the sport variations used in MMA. Choose someone who teaches the real forms.
The style of Karate we teach here at Martial arts Charleston was founded by a Ju Jitsu Master, Hirinori Ohtsuka. Wado Ryu Karate incorporates a lot of Jujitsu moves and principles in it's foundations.