The Atlantic has published a quite comprehensive and complete overview of what Reiki is, including examples where it is used (find the link below). Summarizing, it comes down to this: "Reiki, a healing practice codified in the early 20th century in Japan. In Japanese, rei translates to “spiritual”; ki is commonly translated as “vital energy.” A session often looks more like mysticism than medicine: Healers silently place their hands on or over a person’s body to evoke a “univ