Reiki is a healing energy. It is a Japanese word meaning "Universal Life energy/Life Force". It was developed by Dr Mikao Usui who spent many years practising and teaching Reiki. It is now passed on from Reiki Masters to their pupils.
It is a way of working with healing energy to help to heal yourself and others.
Practitioners are attuned to ancient Reiki symbols during their training. These are used to increase the healing energy.