A headlamp is a portable lighting device worn on the head, typically secured with an adjustable strap. It provides hands-free illumination, making it ideal for activities like hiking, camping, and working in dark spaces. Headlamps usually feature LED bulbs for energy efficiency and long battery life, and they often come with multiple brightness settings. Most headlamps are lightweight and designed to be comfortable for extended wear. They can be powered by batteries or rechargeable sources, and many models are water-resistant, making them suitable for outdoor use. Some headlamps also include features like a red light mode to preserve night vision, which is useful for activities like astronomy or wildlife observation.