Couple psychology is a specialized field within psychology dedicated to the scientific study of the psychological phenomena, dynamics, and processes occurring within romantic partnerships. It investigates the bidirectional influence between individual psychological states and the relational system, examining factors such as communication patterns, emotional dynamics, attachment processes, conflict resolution, and the interplay of individual histories and psychological profiles within the dyad. Its significance lies in providing theoretical frameworks and empirical evidence for understanding, assessing, and intervening in relational functioning and distress.