The word Reiki comes from two Japanese words, Rei which means "Higher Power" or "Gods wisdom" and ki which means "life force energy". Reiki is the flow of energy from the limitless source through the reiki practitioner to the patient. Reiki can unblock emotional or health problems caused by blockages in the life force energy.
This is the starting point, and is taught to people seeking to use the Reiki energy. It's usually a four hour class consisting of Attunements and thought by a Reiki Master, trained in the art of teaching Reiki and passing on the attunements. The Reiki one class will usually touch on Reiki history, benefits of Reiki, information on the chakras, hand positions and the five principal of Reiki.