A halogen bulb is a type of incandescent light bulb that contains a small amount of halogen gas, such as iodine or bromine. This gas helps to increase the bulb's efficiency and lifespan by allowing the filament to burn hotter and produce more light. Halogen bulbs are commonly used in homes, cars, and outdoor lighting due to their bright, white light. These bulbs are known for their compact size and ability to produce a high-quality light output. They are often used in track lighting, spotlights, and floodlights. However, halogen bulbs can get very hot, so caution is needed when handling them.