MIDI is a digital communication standard that allows electronic instruments, controllers, and audio equipment to send and receive performance data rather than audio signals. This data includes information such as note on and off messages, pitch, velocity, control changes, and timing, enabling different devices to work together in sync.

In music gear, MIDI is used to control synthesizers, drum machines, effects units, and software from keyboards, pedals, or computers. It allows complex setups to be automated and coordinated, making it essential for studio production, live performance, and modern electronic and hybrid music rigs.