The document discusses self-concept, which refers to an individual's collection of beliefs and perceptions about themselves. Self-concept has several domains including social, competence, affect, physical, and academic. It also discusses the private and public selves. Self-concept is an organized system of knowledge about who we are and includes aspects like hobbies, family, religion, and nationality. Comparing ourselves to others impacts self-esteem. Theories of self from William James, Carl Rogers, and Albert Bandura are also summarized.