Psychology is the scientific study of behavior and experience, of how humans and animals feel, think, learn and know to adapt to the surrounding environment. Modern psychology has been devoted to collect facts about the behavior and experience, and to organize them systematically, developing theories that explain them. These theories help to know and explain the behaviour of human beings and on occasion even to predict their future actions, and can speak about them.Psychology has been divided into several areas of study. However, these areas are interrelated. Physiological psychology, which is studying the functioning of the brain and nervous system, whereas the experimental psychology designed tests and organizes research to discover, for example, how you learn and remember.Areas of psychology can also be described in terms of areas of application. Social psychologists, for example, are interested in the way in which the people influence each other mutually, and the way in which act in group. Industrial psychologists study behavior at work and the effects of that environment. Educational psychologists help students choose their studies and their future profession. Labour psychology, which is basically operates in service institutions both private and public, intervening in interpersonal, organizational and human resources processes, as well as the psychological factors that impact on labour and productivity. And clinical psychology, which attempts to help those who have problems in their daily lives or are mentally ill.