In a game involving two players, Player A and Player B, if both players choose strategies that result in no player having an incentive to unilaterally change their strategy, what is this situation called?

In game theory, when both players choose strategies where neither has an incentive to change their choice on their own, this situation is called a Nash Equilibrium. This means that given the strategy chosen by one player, the other player is making the best choice they can. For example, imagine Player A and Player B are deciding whether to cooperate or compete in a game. If both players decide to cooperate and realize that changing to compete would not improve their outcomes, they are in a Nash Equilibrium. This concept is important because it helps us understand how players make decisions in competitive situations.