Theories of Development refer to various frameworks that explain how individuals grow and change throughout their lives. These theories often focus on different aspects of development, such as cognitive, emotional, and social growth. Notable theories include Jean Piaget's stages of cognitive development, which outline how children's thinking evolves, and Erik Erikson's psychosocial stages, which describe the challenges individuals face at different ages. Additionally, development can be influenced by environmental factors, as seen in Lev Vygotsky's sociocultural theory, which emphasizes the role of social interactions and culture in learning. Other theories, like Abraham Maslow's hierarchy of needs, highlight the importance of fulfilling basic needs for personal growth and self-actualization.