Gunpowder is a chemical mixture that has been used for centuries as a propellant in firearms and explosives. It is made from three main ingredients: saltpeter, charcoal, and sulfur. When ignited, gunpowder produces a rapid expansion of gas, creating a powerful explosion that can propel bullets or launch fireworks into the sky. Originally developed in China during the 9th century, gunpowder changed the course of warfare and technology. Its invention led to the creation of cannons and guns, which transformed battles and fortifications. Today, while modern explosives have largely replaced traditional gunpowder, it remains an important part of history and is still used in some applications, like fireworks.