An Air Raid Siren is a loud warning device used to alert the public of impending danger, particularly during military attacks or natural disasters. These sirens produce a distinctive wailing sound that can be heard over long distances, ensuring that people are aware of the threat and can take appropriate action. They are often installed in urban areas and are tested regularly to ensure functionality. Historically, air raid sirens were crucial during World War II, signaling the approach of enemy aircraft. Today, they are still used in various emergency management systems, often in conjunction with other warning methods like text alerts and broadcast media to provide timely information to the public.