Reward processing is a core concept within neuroscience, psychology, and economics that investigates the multifaceted processes by which organisms detect, evaluate, and respond to stimuli, events, or internal states that are perceived as beneficial or reinforcing. This interdisciplinary field examines the neural circuits, computational algorithms, and behavioral outcomes associated with the anticipation, receipt, and evaluation of rewards, highlighting its fundamental role in motivation, learning, decision-making, and the regulation of adaptive behavior.