The document discusses several key concepts related to the self, including self-concept, self-esteem, self-efficacy, and introspection. It describes self-concept as how individuals see themselves, involving beliefs about their characteristics, attributes, and how they relate to others. Self-esteem refers to one's evaluation of self-worth, while self-efficacy is one's belief in their ability to achieve goals and handle tasks. Introspection involves examining one's own thoughts, feelings, and motives.