Hypnotherapy assists my clients in using imagery to:

Develop healthier living patterns such as freedom from smoking,
healthier eating, and the desire to exercise

Gain insight

Find new solutions

Restructure old, restrictive, limiting ideas

Intensify positive feelings

Eliminate negative feelings

Strengthen a sense of self-control

Develop new, healthy habits

Reduce or eliminate a symptom

Discover initial causes of problems

Re-educate and reprogram the sub-conscious mind

Expand and enlighten personal growth and creativity
Per the Wikipedia:

Hypnosis is a mental state, 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, or may be self-administered. The
use of hypnotism for therapeutic purposes is referred to as "hypnotherapy".

Although a popular misconception is that hypnosis is a form of
unconsciousness resembling sleep, contemporary research suggests that it
is actually a wakeful state of focused attention and heightened suggestibility,
with diminished peripheral awareness.