Fuses are an essential component of fireworks. They are used to ignite the fireworks and control the timing of their explosions. The fuse is a thin cord or tube filled with a pyrotechnic composition that burns slowly and steadily, providing enough time for the user to light the fuse and get a safe distance away before the firework explodes. The length of the fuse can vary depending on the type of firework and the desired timing of the explosion. Overall, fuses play a crucial role in ensuring the safe and effective use of fireworks.