John Wilkes Booth was the son of prominent, wealthy actors. He, too, became an actor and was so popular, he was one of the first to have his clothes ripped off by fans. Hulton Archive/Getty hide caption
Psychology is the systematic investigation of the human mind, including behavior and cognition. It thus encompasses both normal and abnormal behavior. On the other hand, psychiatry is a branch of medicine dealing with mental illness.
Many people think there is an obvious difference between mental illness and psychological health but very often the differences are misunderstood. Mental Illness refers to alterations in thinking, emotions or behaviors that create distress and impaired functioning for the individual.