A persona is the way a person portrays himself or herself to the world, the personality features that others perceive in this individual. Personas may be found in both literature and everyday life. The word "persona" comes from the Latin for "mask." Personality traits are general tendencies or patterns of behavior that define a person's character. Personality traits are what make each of us unique individually and contribute to our social group behaviors. Some examples of personality traits include being extroverted or introverted, honest or deceitful, friendly or hostile. People tend to use these traits to describe one another based on their relationships to them. Personalities can be used to describe individuals who have similar traits. For example, two people might be described as having "friendly personalities." They are easy to get along with, likeable, and willing to help others. Psychologists study personologies to understand how people think and act. In doing so, they try to identify which traits people possess and how those traits influence their behavior. Personalities can be examined from several angles including psychoanalytic, behavioral, and cognitive. Psychoanalysts believe that personalities are formed by interactions between an individual's genetic makeup and his or her environment.