Well..I don’t see a single answer that’s fit for a five year old…This will hopefully help…
Playing a 1080p video on a 1080p monitor means you have only one color per pixel for the monitor to decide what color to show. Playing a 4k video on a 1080p monitor gives the monitor 4 colors it can decide to mix together to make each pixel. That helps a little, but there’s more you can do with all that extra information such as knowing where the edge of something is in the image so you can change the pixel color more accurately, making the image look crisp and clean.
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