Siren sounds are loud, attention-grabbing noises typically used by emergency vehicles like ambulances, police cars, and fire trucks. These sounds serve to alert pedestrians and other drivers of the vehicle's presence, especially in urgent situations. Sirens can vary in pitch and tone, often alternating between high and low frequencies to ensure they are heard over background noise. In addition to emergency vehicles, siren sounds are also used in various warning systems, such as those for severe weather alerts or natural disasters. These sirens are designed to notify the public of potential dangers, prompting people to take necessary precautions for their safety.