A nightlight is a small, usually electrical light source that provides minimal illumination in a dark space. It's designed to provide comfort and safety by reducing shadows and preventing people from stumbling or bumping into objects in low-lit areas such as hallways, bedrooms, and bathrooms during the nighttime hours. Nightlights are often used in children’s rooms to help them feel more secure while they sleep, but can also be useful for adults who may have difficulty navigating a dark room or staircase.