Applied psychology can be defined as psychology placed at the service of real life, because its ultimate goal is to solve problems related to everyday life. The main tools of applied psychology are the theories on human behaviour and on the functioning of cognitive processes and for this reason it cannot ignore theoretical psychology. Theoretical psychology, in fact, provides the applied psychology with the conceptual assumptions necessary to act effectively. Applied psychology in turn is divided into various branches including: -clinical psychology; -occupational psychology; - forensic psychology and sports psychology. Its field of action, however, is constantly evolving and goes hand in hand with the progress of theoretical psychology. Here is in detail what the various branches of this fascinating discipline are and what they deal with. Clinical psychology deals mainly with diseases of a psychological nature, whether of a relational, individual or family type. Its ultimate goal