Reiki is one of the more widely known forms of energy healing. Energy Healing involves direct application of Chi for the purpose of strengthening the client’s energy system (aura). Chi is the term used by the Chinese mystics and martial artists for the underlying force of the Universe.
Mystics in all cultures talk about the physical universe being made of an underlying form of something; much as modern physics research is now coming to understand the Universe is made of energy which is subject to (or affected by) thought.
Science now agrees with the mystics, going so far as to claim we create our own reality from our thinking and the thoughts we share between each of us every day.
Since the word Reiki means Universal Life Force Energy, it (strictly speaking) refers to the energy and not the specific techniques taught by Reiki Masters. The techniques are more properly called the Usui System of Natural Healing after the founder of the system,
Dr. Mikao Usui.