Okay kiddo, have you ever played with building blocks or legos? Think about taking a picture of your building from a certain angle, that shows all the sides, but keeps everything the same size, like a map.
Axonometric projection works kind of like that, but with more complex shapes. It's a way of drawing a 3D object, like a house or a car, on a flat piece of paper so you can see all of its sides and features.
Now, imagine if you were inside a glass box and the object was inside too. You could see all the sides of the object through the glass, right? That's kind of what axonometric projection does. It shows you all of the sides of an object as if you were looking at it from the inside of a box.
There are three common types of axonometric projection: isometric, dimetric, and trimetric. They all show the object in different ways - some have straight lines and angles, while others have curved lines.
Overall, axonometric projection is a really cool way to show what something looks like in 3D, even though it's just a flat drawing. Pretty neat, huh?