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ATP is the primary energy currency of cells, serving as a molecular unit for energy transfer. Through cellular respiration, ATP is synthesized from adenosine diphosphate (ADP) and inorganic phosphate (Pi) in the presence of energy derived from food molecules such as glucose. ATP hydrolysis releases energy that drives various cellular processes, including muscle contraction, active transport of ions across cell membranes, and biosynthesis of macromolecules like proteins and nucleic acids.