Yeah, there are indeed very many myth connect to the word "hypnosis". Even though there are many different things doing the same thing and calling it something different (like mind coaching).
Yes, the really do. It is understandable though because of the misinformation that is spread and how someone look on the outside when they are in that different state of mind.
It is basically just using all of your inner resources (connected to your subconscious) to achieve any goals or aspirations that you would like to create in your life.