Soy wax is derived from a vegetable (soy beans), while it's counter partner, paraffin wax is derived from petroleum (a refined a gasoline product).
Soy wax is a natural, renewable resource.
Soy wax is biodegradable and cleans up with plain old soap and water.
Soy wax has a lower melting point than paraffin wax and because of this, soy candles will burn slower or longer than paraffin candles.
Soy wax burns with zero petro soot, creating petro soot free candles. Paraffin candles burn with petro-soot.