Fire detectors are devices designed to sense smoke, heat, or flames in order to alert people to the presence of a fire. They are commonly found in homes, offices, and public buildings, providing an essential safety feature. When smoke or heat is detected, the device emits a loud alarm, giving occupants time to evacuate and call for help. There are different types of fire detectors, including ionization smoke detectors, which are sensitive to fast-flaming fires, and photoelectric smoke detectors, which are better at detecting smoldering fires. Some detectors also include heat sensors and can be interconnected to provide comprehensive coverage throughout a building.