Psychology is as vast as the human mind. This field deals with multiple sections of the human brain. It is defined as the scientific study of perception, attention, emotion, motivation, personality, behavior and interpersonal relationships. In some cases, even the unconscious mind becomes a part of the study.

As psychology deals with just more than one aspect of human behavior, there are different types of psychologists who specialize in different fields of psychology. The common ones are clinical psychology, counseling psychology, school psychology, forensic psychology, health psychology, neuropsychology, industrial-organizational psychology, developmental psychology and research psychology.