Pure glucose refers to a form of carbohydrate that is composed solely of glucose, which is a simple sugar. Glucose is an essential nutrient for humans and other animals, serving as the primary source of energy for our cells. In its pure form, it means that the substance contains no additives or impurities, just 100% glucose. This can be important in medical applications where a specific concentration of glucose is required, such as intravenous feeding or testing purposes.