Personality is defined as the sum of a person's outer and inner qualities that influence how they interact with situations and people. It is shaped by both inherent traits and development over time. There are many types of personalities, but they can generally be categorized as introvert, extrovert, ambivert, positive, or negative based on tendencies towards social engagement, risk-taking, and optimism versus pessimism. A person's unique combination of these factors forms their overall personality.