Couple relationships, friendships, and social relationships in the workplace are just a few areas where recent psychological research has important theories and findings to offer. This volume primarily presents empirical findings from social and developmental psychology in an easily understandable manner, supplemented by current insights from evolutionary and neuropsychology. From a psychological perspective, various social relationships and their changes due to societal and communication technological shifts are examined. The theoretical, empirical, and practical insights contribute to the understanding, shaping, and further exploration of relationships.