A "fire detector" (also known as a smoke alarm or fire alarm) is a device that is designed to detect the presence of a fire or smoke in a building or area. Synonyms for "fire detector" include smoke detector, fire alarm system, flame detector, heat detector, combustion detector, and fire sensor. These devices are essential for fire safety and are installed in homes, workplaces, and public buildings to alert occupants in the event of a fire. It is important to regularly test, maintain, and replace fire detectors to ensure they are functioning properly and to reduce the risk of fire-related injury or death.