Answer:
The simple answer is potential or stored energy. More complexely, chemical energy- energy is stored within bonds holding together mollecules of protein, fats, and sugars.
Actually, sugars are the primary source of energy for living beings, which convert glucose mollecules (C6H12O6) and oxygen into H2O, CO2, and mollecules called ATP or adenosine triphosphate which are used to perform many tasks in the body. this is called glycolysis.
source: awnsers.com