Reiki is a Japanese technique for stress reduction and relaxation that also promotes healing. It is administered by "laying on hands" and is based on the idea that an unseen "life force energy" flows through us and is what causes us to be alive.
The word Reiki is made of two Japanese words - Rei which means "universal consciousness/spiritual wisdom" and Ki which is "life force energy". So Reiki is actually "spiritually guided life force energy."
Reiki can also be placed in objects, and they can project the energy infused in them.
Reiki has been around for thousands of years. Its current form was first developed in 1922 by a Japanese Buddhist called Mikao Usui.