Abnormal psychology is a branch of psychology that deals with the study of unusual behavior, emotion and thought. The study of adaptive behavior and maladaptive behavior falls under this domain. Abnormal psychology also deals with behavior in a clinical context and identifies several causes for different conditions. It involves diverse theories from the general field of psychology and focuses on what exactly is meant by abnormal. It has three different categories to classify mental disorders that are subnormal, supernormal and paranormal. Abnormal psychology revolves around two major paradigms for explaining mental disorders i.e. the psychological paradigm and the biological paradigm. The psychological paradigm deals with humanistic, cognitive and behavioral causes and effects of psychopathology. The biological paradigm involves theories that focus more on physical factors. This book unravels the recent studies in the field of abnormal psychology. It analyzes and upholds the pillars of this field and its utmost significance in modern times. This book is appropriate for students seeking detailed information in this area as well as for experts.