The acronym MIDI stands for “Musical Instrument Digital Interface.” In the simplest explanation, MIDI is a language (technically speaking, it’s a protocol) that allows digitally-controlled musical instrument devices to communicate to each other. MIDI has been around since the early 1980’s. It was primarily used with synthesizers and sequencers, but quickly got implemented on all kinds of musically-related gear (drum machines, mixers, drum pads, synchronization boxes, etc.)