Ok kiddo, have you ever played with some colorful shapes? Automatic vectorization is kind of like that, but with pictures on the computer!
Imagine you have a bunch of pictures made up of a bunch of tiny dots, just like how your drawings at school are made up of small dots too. Each dot is called a pixel.
Now imagine that instead of drawing each picture with dots one at a time, we could tell the computer to draw entire sections using just one instruction - kind of like saying "draw all the dots in this area red" with just one command.
That's what automatic vectorization does. It takes pictures made of lots of dots and converts them into larger shapes that are easier for the computer to understand.
This lets the computer create images faster and with less processing power. Just like how combining a bunch of little toys into one big toy can make it easier for you to play with them all at once!