A heater is a device used to generate warmth in a space. It works by converting energy, often from electricity or gas, into heat. Heaters come in various types, including electric heaters, gas heaters, and radiant heaters, each designed for specific heating needs and environments. Heaters are commonly used in homes, offices, and other buildings to maintain a comfortable temperature during cold weather. They can be portable or fixed installations, and many modern heaters include safety features like thermostats and timers to enhance efficiency and prevent overheating.