In game theory, Nash Equilibrium is a condition when unilateral actions will not yield a better outcome for any parties in the game. Hence, players have no incentive to deviate from their current strategies. It means a player’s strategy is optimal and has minimised their potential loss. Nash Equilibrium only applies to non-cooperative games where one cannot trust their opponents.
Nash Equilibrium is named after the mathematician John Nash (depicted in the movie A Beautiful Mind).
A game can have multiple Nash Equilibrium or none.