What is the use of furnace?

A furnace is primarily used for heating spaces, such as homes and buildings, by generating and distributing warm air. It operates by burning fuel (like natural gas, oil, or wood) or using electricity to produce heat, which is then circulated through ducts or radiators. Additionally, furnaces can be employed in industrial applications for processes that require high temperatures, such as metalworking or material processing. Overall, furnaces are essential for maintaining comfortable living conditions and supporting various industrial functions.