In Jean Piaget's theory of cognitive development, the preoperational and sensorimotor stages are two distinct phases in a child's intellectual development:
Sensorimotor
The first stage, which occurs from birth to age 2, is when children learn about the world through their senses and motor skills. They develop object permanence and start to coordinate their senses and movements.
Preoperational
The second stage, which occurs from age 2 to age 7, is when children develop symbolic thinking, language, and pretend play. They can represent things, places, and events through speech, art, and physical objects. However, their thinking is egocentric, and they struggle with logical reasoning.
Piaget's theory of cognitive development also includes the concrete operational stage, which occurs from age 7 to age 12, and the formal operational stage, which occurs during adolescence and adulthood.