Civil defense sirens are loud warning devices used to alert the public about emergencies, such as natural disasters or military attacks. They are designed to be heard over long distances and can produce various sounds to convey different messages. These sirens are often installed in urban areas and are tested regularly to ensure they function properly. In many regions, civil defense sirens are part of a broader emergency management system that includes emergency alerts, evacuation plans, and public safety education. When activated, they prompt people to seek more information through local news or official channels, helping to keep communities safe during critical situations.