A defense contractor is a private company that provides products or services to government agencies, particularly in the area of national security and military operations. These contractors may supply weapons, vehicles, technology, or support services to the military, helping to enhance the capabilities of the armed forces. Defense contractors often work under contracts awarded by government entities, such as the Department of Defense in the United States. Their work can range from research and development to manufacturing and maintenance, playing a crucial role in ensuring that military personnel have the necessary tools and resources to perform their duties effectively.