Incandescent light is produced when a material, typically a tungsten filament, is heated until it glows. This process occurs in incandescent bulbs, which convert electrical energy into light through resistance. The filament reaches high temperatures, emitting visible light as well as heat. These bulbs have been widely used since the late 19th century, thanks to inventors like Thomas Edison. However, they are less energy-efficient compared to modern lighting options, such as LED and CFL bulbs. Incandescent lights are known for their warm glow, making them popular in homes and decorative settings.