A smoke detector is a safety device designed to detect smoke as an indicator of fire. It works by using sensors to identify smoke particles in the air, triggering an alarm to alert occupants of potential danger. Smoke detectors are commonly found in homes, offices, and public buildings to enhance fire safety. There are two main types of smoke detectors: ionization and photoelectric. Ionization detectors are more responsive to fast-flaming fires, while photoelectric detectors are better at sensing smoldering fires. Regular maintenance, such as testing and replacing batteries, is essential to ensure their effectiveness in emergencies.