A calorie is a unit that is used to measure energy. The Calorie you see on a food package is actually a kilocalorie, or 1,000 calories. A Calorie (kcal) is the amount of energy needed to raise the temperature of 1 kilogram of water 1 degree Celsius.
Calories are the energy value of food measured because if you look at the back of soda cans and everything you see that it says 200 calories for example
