The defense industry refers to the sector that produces goods and services to support national security and military operations. This includes the manufacturing of weapons, vehicles, and technology, as well as providing services like logistics and training. Companies in this industry often work closely with government agencies to meet specific defense needs. Key players in the defense industry include large corporations such as Lockheed Martin, Raytheon, and Northrop Grumman. These companies develop advanced systems like fighter jets, missiles, and cybersecurity solutions. The industry is crucial for maintaining a country's military readiness and technological edge in global security matters.