Okay kiddo, have you ever played with LEGOs? Well, imagine that instead of building things with blocks, you are building things with tiny, tiny computer chips. N'aschi is basically a special language that you use to tell these tiny computer chips what to do.
Just like how you have to learn the rules of the game when playing a new board game, these computer chips need to be told specific steps to follow in order to do what you want them to do. N'aschi is a way to communicate those steps to the chips.
So, imagine you want a robot to move forward, you would use n'aschi to tell the chips in the robot's brain to move the robot's legs forward. Or, if you want your computer to sort a bunch of files, you would use n'aschi to tell the computer which files to look at and how to sort them.
It's like a secret code for computers, but once you learn it, you can use it to make amazing things happen!