Qigong is a comprehensive healing system from China that works with "life force energy" or "chi" (also spelled qi) as the basis of health and well-being. It has been around for thousands of years, and has hundreds if not thousands of forms and branches. Qigong consists of movement (like Tai Chi), meditation, and energy healing.
You will read many different definitions (and spellings!) of Qigong. From the Global Qi Project website: