A firecracker is a small, explosive device that produces a loud noise and bright light when ignited. It typically comes in the form of a tightly coiled paper tube with a fuse at one end and an explosive charge inside. When lit, it emits a burst of sparks and makes a crackling sound before exploding into a shower of sparks and smoke. Firecrackers are often used during celebrations such as Fourth of July or Chinese New Year, but they can also be dangerous if not handled properly.