A fire alarm is a safety device designed to detect smoke or heat and alert people to the presence of a fire. It typically consists of a sensor, an alarm sound, and sometimes a visual indicator. When smoke or heat is detected, the alarm activates, warning occupants to evacuate the building and seek safety. Fire alarms can be found in various settings, including homes, offices, and public buildings. They are often connected to a fire department or a central monitoring system, ensuring a quick response to potential fires. Regular maintenance and testing of fire alarms are essential for effective operation.