Acupuncture is a technique in which practitioners stimulate specific points on the body—most often by inserting thin needles through the skin.
Traditional acupuncture is based on the belief that an energy, or "life force", flows through the body in channels called meridians. This life force is known as Qi (pronounced "chee").
Practitioners who adhere to traditional beliefs about acupuncture believe that when Qi does not flow freely through the body, this can cause illness. They also believe acupuncture can restore the flow of Qi, and so restore health.