Jean Piaget is the psychologist who developed the theory of cognitive development, which describes how children's thinking evolves in stages as they grow.
Piaget’s Four Stages of Cognitive Development:
Sensorimotor Stage (0–2 years)
Preoperational Stage (2–7 years)
Concrete Operational Stage (7–11 years)
Formal Operational Stage (11+ years)
His theory emphasizes how children actively construct knowledge through interaction with their environment.
