ATP (adenosine triphosphate) is an energy-rich molecule found in the cells of all living organisms. The primary function of these organic molecules is to capture the chemical energy obtained from the breakdown of food molecules and release it to fuel variouscellular processes such as DNA and RNA synthesis, synaptic signaling, intracellular signaling, muscle contraction, active transport, and purinergic signaling. ATP molecules provide energy for both exergonic as well as endergonic processes and can be recycled after every reaction.