Blackwell's Criterion is a decision-making principle used in statistics and economics to compare two different decision-making strategies. It helps determine whether one strategy is superior to another based on the information available. If one strategy consistently leads to better outcomes than another, it is considered more efficient. The criterion is often applied in the context of sequential decision-making and information theory. It emphasizes the importance of using all available information to make optimal choices. By analyzing the expected outcomes of different strategies, Blackwell's Criterion aids in identifying the most effective approach in uncertain situations.