Why do rockets use gunpowder?

Rockets typically do not use gunpowder as their primary propellant; instead, they rely on more advanced propellants that provide higher efficiency and thrust. However, gunpowder can be used in smaller, solid-fuel rockets, especially in model rocketry, due to its availability and relatively simple combustion characteristics. Gunpowder burns rapidly, producing gas that can create thrust, but for larger space missions, more sophisticated solid or liquid fuels are preferred for their performance and controllability.