The Law of Effect is a psychological principle proposed by Edward L. Thorndike in the early 20th century. It states that behaviors followed by satisfying outcomes are more likely to be repeated, while those followed by unpleasant outcomes are less likely to occur. This principle highlights the role of consequences in shaping behavior. In essence, the Law of Effect suggests that reinforcement strengthens behavior, while punishment weakens it. This concept laid the groundwork for later theories in behaviorism, influencing the work of psychologists like B.F. Skinner, who further explored the relationship between behavior and its consequences through operant conditioning.