Margarine is a non-dairy product created as a substitute for butter. While originally made from animal fat .today the primary ingredients include vegetable oil, water, salt, emulsifiers, and some also include milk. Margarine can be found in both sticks and tubs. margarine, food product made principally from one or more vegetable or animal fats or oils in which is dispersed an aqueous portion containing milk products, either solid or fluid, salt, and such other ingredients as flavoring agents, yellow food pigments, emulsifiers, preservatives, vitamins A and D, and butter.