Pixel graphics is literally little squares of different colors. If you want to make a circle, you have to approximate it with the closest squares on the grid. Pixels on most screens are really tiny so it looks smooth at native resolution, but when you zoom in you’ll eventually see those square pixels making a rough edge.
Vector graphics are defined mathematically. The circle has a center and a radius. The screen just makes pixels to display it on the fly. When you ‘zoom in’ on the circle, the screen makes new pixels to approximate it. When you print it, at any scale, the printer can get as close to that theoretical circle as it’s capable of with its printing resolution no matter how ‘zoomed in’ the circle is.
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