MIDI files are functionally identical to MID files and serve as the standard protocol for digital music interaction. They contain instructions that tell electronic instruments how to produce sound, rather than containing the sound itself. MIDI is the backbone of modern music production, allowing composers to arrange complex orchestrations using virtual instruments. Sample MIDI files are used to test Digital Audio Workstation (DAW) import capabilities. Developers use them to verify that track automation and controller data (like sustain or pitch bend) are preserved. They are also used to test cross-platform compatibility ensuring that a sequence composed on one system sounds correct on another.