An incandescent light bulb is a type of electric light that produces light by heating a thin filament, usually made of tungsten, until it glows. When electricity passes through the filament, it heats up and emits visible light. These bulbs are known for their warm, yellowish glow and have been widely used in homes and businesses. Despite their popularity, incandescent bulbs are less energy-efficient compared to other lighting options, such as LED or fluorescent bulbs. They convert a significant amount of energy into heat rather than light, leading to higher electricity costs and shorter lifespans.