Macronutrients are essential for proper body functioning, and the body requires large amounts of them. All macronutrients must be obtained through diet; the body cannot produce macronutrients on its own.
Carbohydrates were discovered to be energy to the body by Justus von Leibig in mid 1800.
Carbs are very large molecules made of carbon, oxygen, and hydrogen. Some examples if carbs are potato, noodles/pasta, bread, crackers, cakes, flour, etc.