Reiki is a healing technique which works on the basis of prana. Prana is nothing but life force, when we breath along with air we also take prana from the universe. Prana is not visible to eyes. Prana flow though every part and cell of the body. Chakras in our body pays important role in controlling prana and supplying it to different parts.
Mikao Usui is the founder of reiki and he made some principles for reiki healers. He is from Japan. Unbalance of prana in body causes illness, Prana should be in balance insufficient or extra prana willl cause problems to healh. In reiki healers sends prana through their hands to the patient or sufferer by touching their body. To become Reiki healer one should be take initiation because for transmitting prana his body and chakras become ready. There are different levels in reiki, in higher levels the healer can send prana to distant person.