What do you mean by 320x480 pixels?

320 x 480 pixels typically would mean that the display of the technological device, (probably a television, computer monitor, or other visual device. etc.) would have 320 pixels on the shortest side of the screen and 480 pixels on the adjacent side. Thus the screen would have 153600 total pixels in the screen, but by writing the dimensions, the manufacturer can keep better track of the brands and not be faced with two different dimensions equalling the same number of total pixels.