Glow-in-the-dark stars are small, luminous decorations that can be applied to walls or ceilings. They are made from materials that absorb light during the day and then emit a soft glow in the dark. This effect is often achieved using phosphorescent substances, which store energy from light sources. These stars come in various shapes and sizes, making them popular for children's bedrooms or playrooms. When placed on surfaces, they create a starry night effect, helping to soothe children to sleep. They are typically easy to apply and remove, making them a fun and temporary decor option.