MIDI is a technology that represents music only in digital form. Unlike other digital music technologies such as MP3 and CDs, MIDI messages contain individual instructions for playing each individual note of each individual instrument. So with MIDI software it is actually possible to change just only one note in a song, or to orchestrate and entire song with entirely different instruments. And since each instrument in a MIDI performance is separate from the rest, its easy to «solo» (listen to just one) individual instruments and study them for educational purposes, or to mute individual instruments in a song so that you can perform that part yourself.
MIDI is also easy to find in the world of personal computing. If your computer has a sound card, it also has the ability to play MIDI files (using a built-in hardware or software synthesizer that responds to MIDI messages), and with an adapter can also be connected to other MIDI-equipped products, allowing you to take advantage of various computer programs that helps you learn, play, create and enjoy music. Midi is great for educational and creativity purposes, specially with the right software.