Developmental models are frameworks that describe the stages and processes individuals go through as they grow and change over time. These models can apply to various areas, including physical, cognitive, emotional, and social development. They help researchers and educators understand how people develop and what factors influence their growth. One well-known example of a developmental model is Erik Erikson's psychosocial stages, which outlines eight key conflicts that individuals face throughout their lives. Other models, like Jean Piaget's cognitive development theory, focus on how thinking and understanding evolve from childhood to adulthood. These models provide valuable insights into human behavior and development.