A State Department is a government agency responsible for managing a country's foreign affairs and international relations. In the United States, the U.S. Department of State oversees diplomatic missions, negotiates treaties, and represents the country in international organizations. It plays a crucial role in shaping foreign policy and promoting national interests abroad. Each U.S. state also has its own state department, often referred to as the State Department or Department of State. These departments handle various state-level issues, including business regulations, public safety, and environmental policies. They work to implement state laws and serve the needs of local citizens.