NLP is a set of mind skills that can help most people find the solution to their problems. Our perception greatly affects our nervous system (neuro); when we begin to think, in our minds, we are making movies: creating pictures, sound and feelings. We could be talking (linguistic) to ourselves (internal) or hearing sounds around us (external). Think of it like this: all the information coming your internal world or being drawn in from the external world is data sent for processing to the nervous system. From there we give it meaning which in turn creates behaviour. Have a look at the NLP model of communication.