MIDI (Musical Instrument Digital Interface) is the industry standard communications protocol (started in 1982) which allows (MIDI capable) electronic musical instruments and sequencers (or computers with MIDI interface and music software) to communicate with each other. A typical use in the early days would be to use a sequencer to record and play one or more hardware synthesizers. Nowadays, musicians are using a variety of MIDI controllers and computers with music (sequencer) software to record or write musical ideas and play them back on software (virtual) instruments (installed on the computer) or through external hardware synthesizers, audio samplers or drum machines.
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