A welding helmet is a protective gear worn by welders to shield their eyes and face from harmful light and sparks produced during welding processes. It features a darkened lens that automatically adjusts to the brightness of the welding arc, allowing the welder to see the work clearly while protecting against intense ultraviolet (UV) and infrared (IR) radiation. Most welding helmets are designed to be lightweight and comfortable, often equipped with adjustable headbands for a secure fit. Some models also include additional features like built-in ventilation and flip-up lenses for convenience, enhancing safety and efficiency during welding tasks.