What do 4th speakers do in debates?

In debates, 4th speakers typically serve as the final rebuttal for their team, synthesizing arguments presented by both their side and the opposition. They aim to highlight key issues, clarify misunderstandings, and reinforce their team's case while undermining the opposition's arguments. Their role is crucial in summarizing the debate's key points and persuading the judges to favor their team's position. Additionally, they may address any new arguments introduced during the debate to ensure a comprehensive defense of their side.