What are "nested lists or 2d grind or matrices"used for?

Question

I know how to code it but I can't find a real-life example for it

Answer 1

Yes, as you said but this is one screen or one picture, what I describe. For example you want to overwork an 2D digital image, a foto you made with smartphone, with your code. There are few thousand pixels. And you want to make it darker. The code has to take each pixel and make something with it. A matrix is here very helpful.

Answer 2

This is real live. Imagine a picture. This is something what is 3d grid, a matrix, which has position coordinates x, y, and a point with a color there in this place and these a few thousand times.

Answer 3

ZIZO Abd alkawy happy coding!

Answer 4

JaScript
I don't think I really get it but
Is it like pixels in screens or something I mean coordinates for every pixel x and y is it like this
Or
Same screen1 but thousands of screens behind and beside and in front of the screen1
Which on of those

Answer 5

JaScript
Oh I think I can understand it now
Matrix is like the whole community or every single thing whatever it was pixels or numbers or words
Thank for help