What Is Personality and Why Does It Matter?

components of personality

Verywell / Emily Roberts

Almost every day we describe and assess the personalities of the people around us. "She has such a great personality," you might say about a friend. "He gets his personality from his dad," you might say about your rambunctious son. While we spend a lot of time talking about personality, many people are not quite sure exactly how and what personality psychology is really all about.

Whether we realize it or not, these daily musings on how and why people behave as they do are similar to what personality psychologists do. While our informal assessments of personality tend to focus more on individuals, personality psychologists instead use conceptions of personality that can apply to everyone. Personality research has led to the development of a number of theories that help explain how and why certain personality traits develop.

Let's take a closer look at exactly what psychologists mean when they talk about personality, how they study human personality and some of the key theories of personality.


While there are many theories of personality, the first step is to understand exactly what is meant by the term personality. The word personality itself stems from the Latin word persona, which referred to a theatrical mask worn by performers in order to either project different roles or disguise their identities.

A brief definition is that personality is made up of the characteristic patterns of thoughts, feelings, and behaviors that make a person unique. In addition to this, personality arises from within the individual and remains fairly consistent throughout life.

How would you define personality? The following are just a few of the definitions that have been put forth by some different psychologists: 

  • "That which permits a prediction of what a person will do in a given situation." -Raymond B. Cattell, 1950
  • "The dynamic organization within the individual of those psychophysical systems that determine his characteristic behavior and thought." -Gordon W. Allport, 1961
  • "The distinctive patterns of behavior (including thoughts and well as 'affects,' that is, feelings, and emotions and actions) that characterize each individual enduringly." -Walter Mischel, 1999
  • "Personality refers to individuals' characteristic patterns of thought, emotion, and behavior, together with the psychological mechanisms -- hidden or not -- behind those patterns." -Funder, 2001
  • "Although no single definition is acceptable to all personality theorists, we can say that personality is a pattern of relatively permanent traits and unique characteristics that give both consistency and individuality to a person's behavior." -Feist and Feist, 2009

While there are many different definitions of personality, most focus on the pattern of behaviors and characteristics that can help predict and explain a person's behavior. Explanations for personality can focus on a variety of influences, ranging from genetic explanations for personality traits to the role of the environment and experience in shaping an individual's personality.

Environmental factors that can play a role in the development and expression of personality include such things as parenting and culture. How children are raised can depend on the individual personalities and parenting styles of caregivers as well as the norms and expectations of different cultures. 


So what exactly makes up a personality? As described in the definitions above, you would expect that traits and patterns of thought and emotion play important roles. Some of the other fundamental characteristics of personality include:

  • Consistency: There is generally a recognizable order and regularity to behaviors. Essentially, people act in the same ways or similar ways in a variety of situations.
  • Psychological and physiological: Personality is a psychological construct, but research suggests that it is also influenced by biological processes and needs.
  • It impacts behaviors and actions: Personality does not just influence how we move and respond in our environment; it also causes us to act in certain ways.
  • Multiple expressions: Personality is displayed in more than just behavior. It can also be seen in our thoughts, feelings, close relationships, and other social interactions.


There are a number of theories about how personality develops. Different schools of thought in psychology influence many of these theories. Some of these major perspectives on personality include:

  • Type theories are the early perspectives on personality. These theories suggested that there are a limited number of "personality types" which are related to biological influences.
  • Trait theories tend to view personality as the result of internal characteristics that are genetically based.
  • Psychodynamic theories of personality are heavily influenced by the work of Sigmund Freud and emphasize the influence of the unconscious mind on personality. Psychodynamic theories include Sigmund Freud’s psychosexual stage theory and Erik Erikson’s stages of psychosocial development.
  • Behavioral theories suggest that personality is a result of interaction between the individual and the environment. Behavioral theorists study observable and measurable behaviors, often ignoring the role of internal thoughts and feelings. Behavioral theorists include B. F. Skinner and John B. Watson.
  • Humanist theories emphasize the importance of free will and individual experience in developing ​a personality. Humanist theorists include Carl Rogers and Abraham Maslow.

Psychology Applications

Research on personality can yield fascinating insights into how personality develops and changes over the course of a lifetime. This research can also have important practical applications in the real-world.

For example, personality assessments are often used to help people learn more about themselves and their unique strengths, weaknesses, and preferences. Some assessments might look at how people rank on specific traits, such as whether they are high in extroversion, conscientiousness, or openness. Other assessments might measure how specific aspects of personality change over the course of development. Such personality assessments can also be used to help people determine what careers they might enjoy, how well they might perform in certain job roles, or how effective a form of psychotherapy has been.

A Word From Verywell

Understanding the psychology of personality is much more than simply an academic exercise. The findings from personality research can have important applications in the world of medicine, health, business, economics, technology, and other areas. Researchers have found that certain personality characteristics may be linked to illness and health behaviors. By building a better understanding of how personality works, we can look for new ways to improve both personal and public health.

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Article Sources
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  1. Bornstein RF. Personality Assessment in the Diagnostic Manuals: On Mindfulness, Multiple Methods, and Test Score DiscontinuitiesJ Pers Assess. 2015;97(5):446–455. doi:10.1080/00223891.2015.1027346

  2. Srivastava K, Das RC. Personality and health: Road to well-beingInd Psychiatry J. 2015;24(1):1–4. doi:10.4103/0972-6748.160905

Additional Reading
  • Carducci, BJ. The Psychology of Personality: Viewpoints, Research, and Applications. New York: Wiley Blackwell; 2009. 
  • John, OP, Robins, RW, & Pervin, LA. Handbook of Personality: Theory and Research. New York: The Guilford Press; 2008.