Reiki is a form of energy healing that originated in Japan in the early 20th century, developed by Mikao Usui. The word "Reiki" comes from the Japanese words "rei," meaning universal, and "ki," meaning life energy. Usui's system is based on the belief that a universal life force flows through all living things and that this energy can be harnessed for healing. Practitioners of Reiki use their hands to channel this energy into a person's body, promoting physical, emotional, and spiritual healing. The benefits of Reiki include stress reduction, relaxation, and enhanced overall well-being. It is often used as a complementary therapy alongside conventional medical treatments to help balance the body's energy, promote healing, and foster a sense of inner peace.