Behaviorism is a learning theory that focuses on observable behaviors and discounts internal mental states. It utilizes positive and negative reinforcement to promote desired behaviors. There are two types of conditioning: operant conditioning, where behaviors are strengthened through rewards, and classic conditioning, demonstrated by Ivan Pavlov's dog experiments. Major contributors to behaviorism include John Watson, Ivan Pavlov, E.L. Thorndike, and B.F. Skinner. Behaviorism can help teachers manage classrooms by reinforcing positive behaviors with students and establishing structured learning environments.