Reiki is a form of alternative medicine called energy healing. Reiki practitioners use a technique called palm healing or hands-on healing through which a "universal energy" is said to be transferred through the palms of the practitioner to the patient in order to encourage emotional or physical healing.
What is Usui Reiki
Usui Shiki Ryoho (the Usui System of Natural Healing, is a Japanese Healing Art. ... The Japanese word 'reiki' can be translated as 'universal life energy' and the Usui System is a way of working with reiki for healing of self and others. The word healing is used in the sense of regaining harmony and wholeness.