Here's a great simple summary from our friends at Bastyr University.
Put simply Naturopathic Medicine is integrative, personalised, preventative health care. Following the 6 core principles:
1. Do no harm
2. Identify and treat the causes
3. Healing power of nature
4. Naturopath as teachers
5. Treat the whole person
6. Focus on prevention
I believe it is the medicine of the future...