A dominant strategy is a decision-making approach in game theory where one choice consistently yields better outcomes for a player, regardless of what others do. This means that, no matter how opponents act, the player will always benefit more by choosing this strategy over any other available options. In many situations, identifying a dominant strategy can simplify complex decisions. For example, in a prisoner's dilemma, each player has a dominant strategy to betray the other, leading to a predictable outcome. Understanding dominant strategies helps in analyzing competitive scenarios in economics, politics, and social interactions.