The intended audience is people who are just learning about programming. I made it after trying to explain this concept twice and completely confusing everyone both times. Any suggestions or things you notice that are wrong or aren't clear?
It's not clear why anyone just learning about programming would need to know this, but somehow already know what unicode and binary are?
Next, you should check hash like MD5.
Now you can represent any file in a fixed-size string. How cool is that?