hihi! this might be a bit confusing so i'll post a lil video on twt too.
a lot of digital art that is made (using Procreate, for example) is raster art. The brush strokes are made up of tiny pixels, like how a photo is made up of tiny pixels. Vectors are points/lines/shapes that are rendered mathematically by my program (adobe illustrator, in my case). I create shapes with my mouse, then fill them in with colour, gradients, etc. Because these shapes are basically math, I can manipulate and change the shapes so they look exactly how I want them. I layer shapes and colours to create people and scenes!