Behaviorism is a learning theory that focuses on how environmental stimuli shape observable behaviors through reinforcement or punishment. Key proponents included Watson, Pavlov, Skinner, Thorndike, and Bandura. According to behaviorism, learning is passive and learners respond to their environment. Teachers can apply behaviorism by rewarding good behaviors like turning assignments in on time through positive reinforcement like stickers or extra points. While rewards are helpful, they should not be overused as students may come to expect rewards rather than being intrinsically motivated to learn.