The study of human behavior and mind is known as psychology. It comprehends the functions of the brain and helps in understanding the processes which make an individual react and behave in a particular manner. The main schools of thought in this subject are biological, cognitive, social, psychoanalysis, etc. This book on psychology is a collective contribution of a renowned group of international experts. It aims to serve as a resource guide for students and experts alike and contribute to the growth of the discipline.