1:  the science of mind and behavior :  the mental or behaviour characteristics of an individual or group :  the study of mind and behavior in relation to a particular field of knowledge or activity3:  a theory or system of psychology it is an interesting subject which requires your patience, sincerity and a perfect relation of your mind logic and society around you .components : face reading - studying diff types of chi's and analyzing any one's behavior. clinical psychology is also one of the component .it is a vast subject and interesting subject for profession .