Reiki is a universal energy healing practice and a complementary modality. It’s a Japanese healing art developed by Dr. Mikao Usui in the early 20th century. The Japanese word Reiki means universal energy, and many Eastern medicine systems work with this energy. The energy is referred to as 'Ki' in Japan, 'Chi' in China and 'Prana' in India, which they believe flows through all living things and is vital to physical, psychological, emotional, and spiritual well being.