Here's what it means in layman's terms
Here's the super easy way to understand all this. Your computer display screen has a finite number of pixels available, and this is called the "screen resolution" such as 1920 x 1440. This means there are 1920 pixels across and 1440 pixels vertically.Everything you see on your computer screen must be drawn and depicted using these pixels, and nothing can be displayed that's only half a pixel. For example, you can't draw a vertical line on the screen that exists between the pixels that are hard-wired into the screen resolution. Everything you view on the monitor -- a computer game, a website, even a video -- is essentially transposed onto the "lattice" of pixels that exist in your hardware.
Your hardware, in effect, has a hard-wired "resolution limit" which defines the smallest size of any object that can be depicted on the screen.
Now, zoom out to the "real" world in which we live..... read more at this link.
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