When we discuss Reiki we are specifically referring to the traditional Mikao Usui system of Reiki, however there are over 150 different healing systems in existence that use the term 'Reiki' in their title. Many modern versions of Reiki bear no relation to Mikao Usui's system or teachings, while some of them do have a loose connection. The differences tend to be the way the energy is accessed channeled and used. Energy healing has likely existed since humankind existed and there are many different disciplines, with differing processes and rituals. The same can be said for other spiritual disciplines such as martial arts or yoga. There are specific connection rituals and practices within Reiki that differentiate it from other healing systems, so it can be confusing for the general public because many systems promoted as Reiki are actually teaching something quite different. What is common to all forms of Reiki is the use of energy for healing and self-development.