The primary energy currency of living cells is adenosine triphosphate (ATP). ATP serves as a critical molecule that stores and transports chemical energy within cells, enabling various biochemical processes, from muscle contraction to biochemical synthesis. When energy is required, ATP is hydrolyzed into adenosine diphosphate (ADP) and inorganic phosphate, releasing energy that can be harnessed for cellular activities. This efficient energy transfer mechanism is essential for maintaining life, as it powers nearly all cellular functions.