Personal relationships is a core concept and interdisciplinary research domain focused on the nature, formation, maintenance, dynamics, and dissolution of close interpersonal connections. This field investigates the processes, structures, functions, and outcomes of voluntary and involuntary bonds between individuals, characterized by mutual influence, emotional investment, interdependence, and varying degrees of intimacy and commitment, exploring their profound impact on individual well-being, health, social integration, and societal structures across the lifespan.