In The Patterns of Milton H Erickson, Richard Bandler and John Grinder described many of the patterns used by this master of hypnosis. But all these patterns are unknowingly and generally inappropriately used by people in everyday communication.
Because of this, it is pointless to distinguish between what is hypnosis and what is communication. The idea of hypnosis is that you can elicit various states of mind in yourself or somebody else. When you start to notice the effects of your communication, you are on your way to becoming a hypnotist.
You can probably remember times when somebody said something that had a profound influence on you. More than likely, your response was partly due to the way he or she was saying it. Maybe they used a compelling image, sound-bite or rhythm?
Matrix fans may remember a speech Morpheus makes to Neo in their initial meeting:
Whilst speaking rhythmically, Morpheus overtly rotates a silver case (containing the red and blue pills) in front of him and says:
"Let me tell you why you're here. You're here because you know something. What you know you can't explain. But you feel it. You've felt it your entire life. That there's something wrong with the world. You don't know what it is but it's there, like a splinter in your mind driving you mad. It is this feeling that has brought you to me. Do you know what I'm talking about?"
I don't know about you, but I felt like I did, even though I didn't. It is a great example of the Milton Model: the description is vague yet compelling.
Whether you want to be a better communicator or just want to protect yourself against undue influence, learning hypnosis is one of the most useful skills to have.