Personality refers to individual differences in characteristic patterns of thinking, feeling and behaving. The study of personality focuses on two broad areas: One is understanding individual differences in particular personality characteristics, such as sociability or irritability. The other is understanding how the various parts of a person come together as a whole.
Adapted from the Encyclopedia of Psychology
Understanding Personality Disorders
What causes personality disorders?
Research suggests that genetics, abuse and other factors contribute to the development of obsessive-compulsive, narcissistic or other personality disorders.