A ceiling fan is a mechanical device mounted on the ceiling of a room or covered area, designed to circulate air and create a cooling effect. It typically consists of a motor housing, a set of rotating blades (usually 3 to 5), and sometimes a light fixture in the center. When the fan operates, the blades spin to move air downward, producing a gentle breeze that helps improve comfort by enhancing air circulation and evaporative cooling on the skin.