Young adult development is the study of the psychological, social, and biological changes individuals undergo during the transition from adolescence to adulthood. This research area examines the critical processes of identity formation, independence, and the establishment of adult roles across various life domains. It investigates phenomena such as cognitive maturation, the negotiation of intimate relationships, educational and occupational attainment, and the integration into societal structures. Characterized by significant variability in timing and pathways, this developmental period is considered crucial for shaping long-term well-being, civic engagement, and overall life course trajectories.