Reiki is defined as Universal Energy or God's energy.
Reiki practice is based on the premise that the life force flows through the 7 chakras in a human body and if any of these chakras get blocked the human body may fall sick, mentally or physically. Accordingly, a reiki practioner channels reiki into the client in order to open any of the blocked chakras.
The process of channeling involves the reiki practitioner entering a meditative state and connecting with God / Creator/ Divine Light. The practitioner then feels this energy passing through his or her body and into the client.