A person's view and assessment of themselves are referred to as their self-concept, which is a key psychological term. It includes all of their opinions, attitudes, values, and self-perceptions in relation to a variety of topics, including their skills, personalities, and social identities. An overview of self-concept and the theory of self is given in this abstract, along with information on how they are formed and how they affect psychological health. It explores well-known self-concept ideas such the self-discrepancy theory and the self-esteem theory. It also looks at how self-concept affects motivation, behaviour, and wellbeing. Understanding self-concept and the theory of self may help people better understand how they perceive and create their identities, as well as the consequences this has for their personal development, social interactions, and psychological health.