Hypnosis is a mental state (state theory) or set of attitudes (nonstate theory) usually induced by a procedure known as a hypnotic induction, which is commonly composed of a series of preliminary instructions and suggestions. Hypnotic suggestions may be delivered by a hypnotist in the presence of the subject ("hetero-suggestion"), or may be self-administered ("self-suggestion" or "autosuggestion"). The use of hypnotism for therapeutic purposes is referred to as "hypnotherapy".
Hypnotherapy involves communication between the subject (patient) and the therapist (hypnotist) and is done by method of suggestion and acceptance. But this is not the only way, and treatment of the subject is generally selected depending on the nature of his problem.