Basically in the very old days before MP3 and digitised music was a thing, storage was very tight. So MIDI is basically a digital version of sheet music that the computer then plays tones for (soundfonts) that simulate the sound of the instrument the sheet music was intended for. MIDIs are very small insize, like, smaller than a typical MS word document.
MIDI was largely used in games in the MS-DOS/Windows 3.11 days when games came on very small floppy disks, as CD roms became more mainstream, music became digital copies of actual recordings instead.
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