Our Ego is what gives us unique individual identity. It is our self.
Ego keeps us alive and in-check. It directs you to think and act in a certain manner. In a way, it protects us. It makes us desire for more and better life.
However, too much ego will not be good for us also. It blocks us from doing certain things. Hypnosis is able to put ego out of the way to do those certain things. Things such as acting in a dramatic manner which, in your usual self, you will not do it.