MIDI means "Musical Instrument Digital Interface." Generally, it is a protocol that allows computers, musical instruments and other hardware to communicate. When we say we provide MIDI files, we mean files in .mid format which can be read and processed by major DAWs (e.g., Ableton, FL Studio, Logic Pro X and Pro Tools). You can read more about MIDI here: https://blog.landr.com/what-is-midi/#MIDI-definition.