What is the relation between joule and ATP?

Joules (J) are a unit of energy in the International System of Units, while adenosine triphosphate (ATP) is a molecule that serves as the primary energy carrier in biological systems. The energy stored in one mole of ATP is approximately 30.5 kJ (or 30,500 joules) when hydrolyzed to adenosine diphosphate (ADP) and inorganic phosphate. Thus, ATP can be understood as a biochemical means of storing and transferring energy, quantified in joules.