Personality is the word commonly used to describe an individual’s collection (total person) of such behavioral traits or characteristics. Personal style or personality is a relatively stable set of traits that aids in explaining and predicting individual behavior. As noted, individuals are all different, yet similar, in many ways.
Why are some people outgoing and others shy, some loud and others quiet, some aggressive and others passive? Traits are distinguishing personal characteristics. Personality development is based on genetics, experience, and environmental factors. The genes you received before you were born influence your personality traits. Your family, friends, school, and work also influence your personality.
In short, personality is the sum of genetics and a lifetime of learning. Personality traits, however, can be changed, with work. For example, people who are shy can change their thoughts and feelings to consciously use more outgoing behaviors.