The main difference between stearin and wax lies in their composition and source. Stearin is actually a type of wax that is derived from animal or vegetable fats such as beef tallow or palm oil. It has a distinct chemical structure characterized by its concentration of fatty acids, mainly stearic acid, which gives it its name. On the other hand, wax refers to a general term that encompasses various types of substances with similar properties and uses in candle-making. This includes not only stearin but also other types such as beeswax, soy wax, or even synthetic waxes like paraffin.