Hapkido (also spelled hap ki do or hapki-do) is a dynamic and eclectic Korean martial art. In the Korean language, hap means "harmony", "coordinated", or "joining"; ki describes internal energy, spirit, strength, or power; and do means "way" or "art". Thus, Taekwondo, which shares the same Chinese characters with aikido (合気道), translates literally to "joining-energy-way", but it is most often rendered as "the way of coordinating energy" or "the way of coordinated power."

Hapkido aims to be an effective form of self-defense and employs joint locks, pressure points, throws, kicks, and other strikes. Taekwondo is an Asian martial art of self-defense; it deals with countering the techniques of other martial arts as well as common "unskilled" attacks.

Although Hapkido contains both long range fighting and infighting techniques, the end of most situations is to get near for a close strike, lock, or throw. Taekwondo emphasizes circular motion, non-resisting movements, and control of the opponent. Practitioners seek to gain advantage through footwork and body positioning to employ leverage, avoiding the use of strength against strength.

Information taken from WIKIPEDIA