A national treasury is a government department responsible for managing a country's finances, including revenue collection, budgeting, and public spending. It plays a crucial role in ensuring economic stability and growth by overseeing the management of national debt and financial resources. National treasuries also issue government bonds and securities to raise funds for public projects and services. They work closely with other financial institutions and agencies to implement fiscal policies and maintain the overall health of the economy, contributing to the financial well-being of citizens and businesses alike.