Glucose is a crystalline white powder which is very soluble in water. It is a carbohydrate and a monosaccharide sugar. The chemical formula for glucose is C6H12O6
The structural formula of glucose is

Glucose sugar is used as fuel by our bodies and is converted into energy through the process of cellular respiration.
Glucose and oxygen ==> Carbon dioxide and water and energy
C6H12O6 + 6O2 ==> 6CO2 + 6H2O + energy