Rectilinear grid

Okay kiddo, imagine you have a piece of paper with lines drawn on it like a grid. The lines on the paper are straight and go up and down, and left to right. That's what a rectilinear grid is - it's a bunch of straight lines that cross each other at right angles (like a plus sign).

Now, let's say you want to draw a picture using this grid. You can draw straight lines along the grid lines to make shapes, and color in the spaces inside those shapes. This makes it easier to draw things that need straight lines and right angles, like buildings or roads.

Rectilinear grids are often used in computer graphics and engineering, because they are easy to work with and can be used to make precise measurements. They can also be used to create 3D models by stacking multiple grids on top of each other.

So basically, a rectilinear grid is just a bunch of straight lines that cross each other at right angles, and it's useful for drawing things with straight lines and for making precise measurements.