Carbohydrates can be defined as any of a group of multiple simple sugars. In more scientific terms, it could be said that carbohydrates are polymers of simple sugars, which are monomers. Another name for "carbohydrate" is a polysaccharide, making sugars a monosaccharide. Disaccharides are groups of two simple sugars. Common carbohydrates are cellulose, starch, glucose, etc.