Glow sticks, also known as light sticks, are portable, chemical light sources that emit bright light when activated. These sticks are commonly used for various purposes, including parties, concerts, camping, and emergency situations. The typical design features a cylindrical, flexible plastic casing that houses a glowing chemical mixture. Upon bending the stick, the internal glass vial breaks, mixing the chemicals and initiating a chemical reaction that produces light. They come in various colors, sizes, and lengths, providing versatility for different events. The light produced can last for several hours, making them perfect for nighttime activities.