Defense systems are organized methods and technologies used by nations to protect themselves from threats, such as military attacks or cyber intrusions. These systems can include a variety of components, such as missile defense systems, radar technology, and cybersecurity measures, all designed to detect, deter, and respond to potential dangers. Modern defense systems often integrate advanced technologies, including drones and satellite surveillance, to enhance their effectiveness. They are crucial for maintaining national security and can involve collaboration between different branches of the military, as well as partnerships with allied nations to strengthen collective defense efforts.