Sucrose, commonly called table sugar, is a disaccharide of glucose and fructose with the molecular formula C12H22O11
Made from adding water to crushed sugar beets and sugar cane, reducing and refining.
It's correct use is to lighten the body and colour of a beer. The incorrect use is to solely increase the alcohol content. Doing this will produce poor quality beer with a cidery taste.
Sucrose can be heated with acid to make invert sugar.