Naturopathy is the art, science and philosophy of natural healing.  Within this philosophy we believe that health is the result of the body being in balance.  When the body is out of balance, disease manifests.  A naturopath helps the body to heal by removing some of the obstacles to balance which helps the body to regain its desired state of homeostasis.  
Since people are multifaceted, the physical, emotional and spiritual/etherical aspects may need to be addressed.  A facilitator of naturopathy addressses these different layers using different tools of naturopathy, including diet, herbs, homeopathy, flower essences, essential oils, emotional release, energy work and more.  These are tools in the tool belt of a naturopath, and each case will require a different approach.  This is why naturopathy is also an art.