The word Qigong is comprised of two characters: Qi (anima, vital energy) and Gong (work, cultivation), and relates to the variety of practices to do with manipulation of Qi - the vital energy behind our movement, emotions and mentality.
The Qi is also the life-force, which we share with the rest of the world. By using specific postures of the body, combining them with directed breath and intention, the Qi can be cultivated and replenished for your own needs, so as to promote health and well-being, and to give you strength to achieve your life goals.
Over the last few decades Qigong has become popular as a self-excercise method. However not many know that it may be also received as an external healing - a process by which a Qigong therapist emits Qi to help resolve Qi stagnation in others and reconnect their energy structure to the abundant energy streams of the natural world. Thus, a few Qigong healing sessions may relieve stubborn chronic pain, promote circulation, and strongly reinforce your body so that it breaks free from ill-being in a most natural way.
Acupuncture is an ancient technique of stimulating special points located along the energy channels with fine needles. The aim is to unbind the flow of Qi - just like in Qigong and other TCM modalities.
Most common 360 points used in Acupuncture is a subset of all active points found in the body when Qigong internal vision is applied (read more about the channels and points here). One of the reasons to choose this subset of points was perhaps due to their safety for needling. However, many of those points also form major intersections of the energy channels, and that allows the practitioners to influence many internal organs at once. Acupuncture needles are left in the body for a few minutes, so that stimulation may be continuous and the body can "memorise" the new altered flow of Qi.