I Wonder - Who Invented Fireworks?

The video explains the accidental invention of firecrackers in China by throwing bamboo into fire. It then describes the discovery of gunpowder around 800 CE by a man seeking eternal life. This gunpowder was used in bamboo or paper tubes to create early fireworks, which, although not colorful, were exciting. The ancient Chinese used these fireworks in ceremonies and celebrations, believing their loud noises and bright lights could scare away evil spirits.

How did ancient Chinese people use fireworks in their culture?

What was the believed purpose of the loud noises and bright lights produced by fireworks?