Rum is a distilled alcoholic drink made from sugarcane byproducts, such as molasses, or directly from sugarcane juice, by a process of fermentation and distillation. The distillate, a clear liquid, is then usually aged in oak barrels. ... Rums are produced in various grades.
Plantation slaves first discovered that molasses, a by-product of the sugar refining process, fermented into alcohol. Later, distillation of these alcoholic by-products concentrated the alcohol and removed impurities, producing the first true rums. Tradition suggests that rum first originated on the island of Barbados.