The arms industry is a global business that manufactures weapons and military technology and equipment. It consists of commercial industry involved in research, development, production, and the service of military material, equipment, and facilities. Arms producing companies, also referred to as defense contractors or military industry, produce arms mainly for the armed forces of states. Departments of government also operate in the arms industry, buying and selling weapons, munitions and other military items. Products include guns, ammunition, missiles, military aircraft, military vehicles, ships, electronic systems, and more.