As hypnotherapy or hypnosis psychotherapy today forms of therapy are summarized u. a. to use the existing knowledge about the effects of trance and suggestions therapeutically.
To promote healing, search and learning processes, either hypnosis is practiced in a more formal sense or everyday trance processes are used for therapeutic work. In addition, hypnotherapy can also be designed as self-hypnosis training or learning of (deep) relaxation exercises.
Source: Wikipedia