On YouTube at least, 1080p doesn’t mean exactly 1080×1920 pixels getting sent too you.
You get compressed information to build a good looking 1080×1920 image. Some shortcuts are taken so they don’t have to send the full amount of pixels and they save bandwidth costs.
For the 4k setting, you get more information, which can build a good looking 4k image, or a really good looking 1080p image
In the video formating, which anyone who edits vidoe deals with, we call this “bitrate”.
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