Sensorimotor Stage: This is the first stage of Piaget's theory, during which infants explore the world through their senses and motor actions.
Concrete Operational Stage: This is the third stage in Piaget's theory, characterized by logical thinking about concrete objects and events.
Formal Operational Stage: This final stage in Piaget's theory involves the ability to think abstractly, reason hypothetically, and engage in advanced problem-solving.