Flash powder is a pyrotechnic composition, a mixture of oxidizer and metallic fuel, which burns quickly (deflagrates) and produces a loud noise regardless of confinement. It is widely used in theatrical pyrotechnics and fireworks and was once used for flashes in photography.
Examples of theatrical binary flash powders. Note the shared oxidizer (A) powder for some types of fuels (B).
Fireworks are a class of low explosive pyrotechnic devices used for aesthetic and entertainment purposes. They are most commonly used in fireworks displays, combining a large number of devices in an outdoor setting. Such displays are the focal point of many cultural and religious celebrations, though mismanagement could lead to fireworks accidents.
Fireworks over Sydney Harbour on New Year's Eve 2006–2007
Bastille Day fireworks (2013) over Paris, traditionally accompanied by a musical show that starts with "La Marseillaise"
A fireworks display on Taipei 101, Taiwan, which in 2005 held the world's first fireworks display on a supertall skyscraper
Fireworks on Qatar National Day 2018 in Doha