In a parliamentary system, opposition parties play a critical role in holding the government accountable. They provide checks and balances by scrutinizing government decisions, policies, and actions, thereby fostering democratic debate. Opposition parties also help represent diverse viewpoints within the legislature, contributing to a more comprehensive discussion on governance issues. By proposing alternative policies and serving as a voice for dissent, opposition parties enable voters to make informed choices during elections. Their effectiveness can vary depending on their cohesion, resources, and the political climate, ultimately influencing overall governance stability and responsiveness.