Jean Piaget was a Swiss psychologist who constructed the theory of cognitive development after observing children for many years. He believed that children think very differently than adults and learn through active experimentation rather than passive instruction. Piaget's theory describes four stages of cognitive development: sensorimotor, preoperational, concrete operational, and formal operational. Each stage is characterized by developments in logical thinking and understanding of the world. Piaget's theory supports integrating technology into education because it provides opportunities to engage diverse learners according to their development levels.