Behaviorism is a foundational theory in psychology and education, positing that behaviors are acquired through conditioning, with key figures including John B. Watson and B.F. Skinner. It encompasses concepts like classical conditioning, where a natural stimulus prompts a response, and operant conditioning, which involves reinforcement and punishment to shape behavior. Despite criticisms regarding its focus on observable behavior and neglect of cognitive processes, behaviorism continues to influence educational practices and therapeutic approaches today.