36 display resolutions, each with its aspect ratio, pixel count and the density it produces on screens from 13 to 32 inches.
How to read a resolution
A resolution is a pixel count, not a measure of sharpness. 1920×1080 is dense on a 13-inch laptop and coarse on a 32-inch monitor, because sharpness is pixels per inch and the inches are not in the number. The other thing the number hides is shape: 1366×768 and 1920×1080 are both sold as 16:9 and only one of them is, which is why a full-screen video on the first is very slightly letterboxed.