An electronic drum is a modern electronic musical instrument, primarily designed to serve as an alternative to an acoustic drum kit or other percussion instruments. An electronic drum consists of an electronic or digital sound module which produces the synthesised or sampled percussion sounds and one or more electric sensors or sensor-equipped pads to trigger the sounds. Like regular drums, the sensors or pads are struck by drum sticks or by the hands (depending on the type of drum pad) and they are played in a similar manner to an acoustic drum kit (or percussion instrument).
Strictly speaking, modules playing pre-programmed electronic drum tracks and electronic or digital drum machines are not electronic drums, because the software, not a drummer or other musician, is triggering the sounds.