Adolescent psychology is a field of study within the major branch of psychology- Developmental psychology- which also constitutes Child and Adult psychology. Any concise definition of adolescence falls short of a comprehensive description of the term because every definition reveals the bias or major interest of the author. Often a technical term is invented in order to create a social condition and a social fact and such has been true with respect to the term, 'Adolescence'. The book considers diverse facets of the Adolescent world, ranging from physical development, cognitive development, moral development, psycho-social development, socialization and psycho-social challenges of adolescence. It is an eye opener for university students in education as well as the Behavioural science of Psychology.