MIDI stands for Musical Instrument Digital Interface. MIDI’s digital signal carries information on pitch, velocity, vibrato, panning and much more – and because it’s universal, it’s compatible with pretty much any brand or platform. MIDI was pioneered by synth legend Dave Smith and Roland founder Ikutaro Kakehashi in the early ‘80s, alongside representatives from Yamaha, Korg and Kawai. The aim was to provide a universal language that would allow instruments to communicate with each other.
It’s most commonly used to control synthesizers and DAW instruments via a controller. This could be anything from a MIDI keyboard to an electronic drum kit. MIDI is usually connected via a round 5-pin connector, often with both in & out functionality. You also see 2.5mm jack connections from time to time. Many modern controllers and instruments have a built-in MIDI interface, meaning you can plug them to your laptop via USB. Other devices and hardware, such as legacy instruments, require an interface to allow you to use them in your DAW.