Counterplans are strategies proposed by the negative team in policy debate that present an alternative solution to the affirmative team's plan. They aim to demonstrate that the affirmative's proposal is not the best option, often arguing that the counterplan is more effective, feasible, or advantageous. By introducing a counterplan, the negative team seeks to shift the focus of the debate and challenge the affirmative's assumptions, providing a distinct path for solving the issue at hand.