The primary source of energy for cellular processes is adenosine triphosphate (ATP). ATP serves as the energy currency of the cell, storing and providing energy for various biochemical reactions, including muscle contraction, nerve impulse propagation, and biosynthetic processes. Cells regenerate ATP from adenosine diphosphate (ADP) through cellular respiration and photosynthesis in plants. Understanding the role of ATP is crucial in biochemistry, physiology, and molecular biology, as it underpins all forms of life in maintaining energy balance.