Reiki was re-discovered by Dr Mikao Usui in the 19th century after reading ancient Buddhist texts.
Reiki is a Japanese word meaning Universal Life Force. This is the energy present in all matter. When this force leaves the body then life has departed.
All cultures and religions have a concept that corresponds to the meaning of Ki in Rei-Ki. The Chinese know this as Chi, the Hindus know this as Prana and the Christian teachings know this as Light.
Because Reiki comes from God, many people find that using Reiki puts them more in touch with the experience of their religion rather than having only an intellectual concept of it.
Every living thing contains Ki and radiates it. Those who have received Reiki attunements have their bodies energy channels opened to connect them to the limitless source of Ki from the universe. A Reiki practitioner can channel this life energy through their hands to themselves or others.