Downsampling.
On a 1080p screen, a 1080p video equals 1 to 1 on pixels to your screen.
A 4K video has to downsample and condense more pixels into one, and having the “average” of all those pixels into one instead of it’s true, single value from a 1080p.
This means the results are more rich, because your 1080p screen pixels instead of holding the single value of a 1080p video, holds an average of the values of the 4K video, having a much better representation of what should really be there, because 4K has enough information and detail to maintain even if it’s viewed in a lower resolution.
Heres an [in-depth explanation](https://youtu.be/YiU-WpXYxoc) with videogames resolution, but should apply to anything media-wise.
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