In this section, we delve into the cognitive and behavioral aspects of self and personality, which are critical for understanding individual identity and social behavior. The concept of self is explored, emphasizing how it is shaped through interactions with significant others, leading to the development of personal, social, and relational selves. Self-esteem and self-efficacy are introduced as vital influences on behavior, affecting how individuals perceive their worth and capabilities. Furthermore, self-regulation is discussed in relation to controlling one’s behavior according to external demands. The section also presents an overview of major theoretical approaches in personality research, including type approaches and trait approaches, thus allowing for a more nuanced understanding of how personality can be measured and assessed. Through understanding these concepts, we gain insights into not only our uniqueness but also our similarities with others, and how these frameworks can help us navigate diverse social settings.