Sugar is the generic name for sweet-tasting, soluble carbohydrates, many of which are used in food.Simple sugars, also called monosaccharides, include glucose, fructose, and galactose.Compound sugars, also called disaccharides or double sugars, are molecules composed of two monosaccharides joined by a glycosidic bond.Common examples are sucrose (glucose + fructose), lactose (glucose Category Music; Song Sugar; Artist Maroon 5; Writers Cirkut, Jacob Kasher, Łukasz Gottwald, Adam Levine, Mike Posner, Ammo; Licensed to YouTube by Sugar definition is - a sweet crystallizable material that consists wholly or essentially of sucrose, is colorless or white when pure tending to brown when less refined, is obtained commercially from sugarcane or sugar beet and less extensively from sorghum, maples, and palms, and is important as a source of dietary carbohydrate and as a sweetener and preservative of other foods.