In the context of Scientology, a "thetan" refers to the spiritual essence or soul of an individual. According to L. Ron Hubbard, the founder of Scientology, thetans are immortal beings who have lived through multiple past lives and possess unique abilities. They are considered the true self of a person, distinct from the physical body and mind. The concept of thetan is central to Scientology beliefs and practices, which aim to help individuals understand and improve their spiritual well-being. Through various techniques, such as auditing, practitioners seek to free the thetan from negative influences and past traumas, ultimately achieving a state of spiritual enlightenment.