Phosphorescent materials are substances that can absorb light and then re-emit it over time. This process occurs when the material captures energy from light sources, such as the sun or artificial lights, and stores it. When the light source is removed, these materials glow in the dark, creating a beautiful effect. Common examples include glow-in-the-dark stars and toys that light up after being exposed to light. The phenomenon of phosphorescence is different from fluorescence, where the glow lasts only while the light is shining. Phosphorescent materials can continue to emit light for minutes or even hours after the light source is gone. This makes them popular in various applications, including emergency signs and decorative items.