Hey there, little buddy!
So, imagine you're sitting in a movie theater and watching a movie. The movie is on a flat 2D screen, but you can see things like people, buildings, and cars that look like they're actually 3D and coming towards you.
That's kind of like what 3D projection is! It's a way of making 2D images look like they're 3D and popping out at you.
To do this, people use special cameras or computers to create two slightly different versions of the same image, kind of like how your eyes see two slightly different images when you look at something.
Then, when these two images are projected onto a special screen using some fancy equipment, your brain combines them and thinks that they're 3D!
It's kind of like a magic trick, but it allows us to see things in movies, video games, or other places in a way that feels more realistic and exciting. Cool, huh?