Subliminal messages are messages that supposedly your conscious mind is unable to hear but which can be heard by your subconscious mind. An example would be when you go shopping in the grocery store and hear some nice soft music playing. Underneath that soft music may be hidden message to get you to buy more things that your conscious mind will not hear, but which supposedly your subcsonsious mind does. I've experimented with both hypnosis and subliminal messages and have found that for me hypnosis works much better than subliminal messages. Maybe someone else has had some success with subliminal messages, but I've always come up no measurable results.