Hypnosis used to aid people seeking a solution to a problem they can't resolve
For anyone concerned that this is a book designed to teach readers how to convince crowds of people to act like chickens or dance to an unheard song just with a carefully placed keyword - relax.
While hypnosis is often paraded in that form with large crowds visiting celebrity hypnosis experts to see what wonders they can perform, the majority of hypnosis used is to aid people seeking a solution to a problem they cannot resolve easily with any other method.