The phrase "best policy" refers to a course of action or decision that is considered to be the most effective, appropriate or beneficial in a given situation. It suggests taking the most rational and logical approach possible, based on available information and consideration of potential outcomes. The term can also imply being cautious, prudent or careful in one's actions, with an aim towards achieving the best results or avoiding negative consequences. In essence, "best policy" is a way of saying that doing something in the most effective manner possible will yield the best outcome.