NLP is the codifying of the natural things that we do. I seek to understand your view of the World and your natural behaviours. Working within your model (of the World), NLP is a framework of techniques that can be used to change behaviour; be that habit breaking or making, etc.
(Oxford Dictionary Definition) "[NLP is] a model of interpersonal communication chiefly concerned with the relationship between successful patterns of behaviour and the subjective experiences (esp. patterns of thought) underlying them" and "a system of alternative therapy based on this which seeks to educate people in self-awareness and effective communication, and to change their patterns of mental and emotional behaviour."