Glow-in-the-dark items are objects that can absorb light and then emit it in the dark. This effect is usually achieved through phosphorescent materials, which store energy from light sources like the sun or artificial lights. When the light source is removed, these materials slowly release the stored energy as visible light, creating a glowing effect. Common examples of glow-in-the-dark items include stickers, toys, and paint. These items are often used for decorative purposes, safety features, or fun activities. They are popular in children's products and can also be found in various applications, such as emergency signs and novelty items.