Hypnosis is a way of communicating ideas in the context of a doctor-patient or therapist-client relationship. It is a therapeutic tool for systematically amplifying dimensions of experience, and then associating those experiences to situations in ways that are useful to the patient. Hypnosis can be used to amplify whatever it is about therapy that makes it therapeutic. It permits a wide range of choices regarding where and how to intervene in the client’s problems. A good hypnotic session, involving appropriate suggestions for contextualization, is thought to yield positive results that last a lifetime and a genuine change occurs in the brains during a hypnotic trance. Hypnosis is a window into the brain-mind, helping patients’ better control stress, pain, habits, dissociative symptoms, and psychosomatic problems. It also provides with clinically useful information about the patient's cognitive and relationship style, providing a means for selecting treatment approaches based on patient characteristics.