Reiki is an ancient Japanese technique to promote healing and relaxation. The word Reiki is composed of two Japanese words: Rei and Ki. Rei translates to "higher power" or "god's wisdom", while Ki translates to "life force energy". Ki is the non-physical energy flowing through everything (people, animals, objects). When a person's Ki is high s/he will feel energized, confident, and strong, but when a person's Ki is low s/he will feel weak, tired, and sick.
Reiki is a form of energy work, where energy is transmitted to the patient via the practitioner's hands. It is a whole body treatment, addressing the physical, spiritual, and emotional bodies. Reiki has been used to treat almost all diagnoses. This modality does not cause harm to the patient and it does not deplete the patient's energy. Instead, it is used to treat ailments and help replenish one's energy.
The 7 chakras can be addressed and balanced during a Reiki treatment. Many times the chakras become balanced once the physical, spiritual, and emotional bodies are treated through this modality, however balancing the chakras is not the sole purpose of this modality.