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A fuse (or fuze) is the part of a pyrotechnic device which initiates the said pyrotechnic device, either thermal, electric or other chemical reaction.
Fuses are different from detonators.
Consist of a wick, embedded with a flammable material, such as flash powder. Nitrocellulose wicks are sometimes used.
Black matches consist of a crude form or burning fuse, it is made by soaking cotton string/sheets in a slurry of black powder.
Safety fuses consist of a "tube" of gunpowder surrounded by a waterproofed varnished jute "rope". Burn rate is around 1 cm/s.
Electric matches use a bridgewire consisting of a heating element to ignite a pyrogen, which in turn ignites the pyrotechnic material.
Sparklers can be used as crude fuses.
Fuses are found in many types of fireworks, though most tend to be pretty short.
Since 2015, using fuses in US requires an ATF license.
Fuses can ignite relative easy and should be kept away from flammable things.