What is a crash cymbal?

Crash cymbals are generally smaller than ride cymbals — typically from 16" to 20", although some drummers use larger sizes. Crash cymbals can be placed around the drum kit, although at least one is traditionally set up between the hi-hat cymbal and mounted tom. Crash cymbals are typically lighter in weight than ride cymbals and are played by “crashing” the stick onto the outer edge of the cymbal.