The State Department's mission is to "promote peace, security, and prosperity around the world through diplomacy, development, and defense." In addition to its diplomatic efforts, the State Department also issues passports and provides other services to American citizens. It also issues visas to foreigners who wish to enter the United States.
The State Department works with other federal agencies, including the Department of Defense, to advance U.S. interests in a complex and ever-changing world. The State Department also works closely with foreign governments and international organizations to promote peace and stability, combat terrorism and proliferation, expand economic opportunity, and protect human rights.