How did firecrackers become part of Diwali celebrations?

Firecrackers became part of Diwali celebrations after gunpowder reached India around the 14th century, with fireworks initially used at royal events. By the 18th century, rulers organised Diwali festivities featuring fireworks, which symbolised royalty and wealth and were also used at weddings and coronations. The tradition spread widely after Independence as the firecracker industry grew.