There are many misleading comments here…
The answer is bitrate.
Bitrate is how many bits the video streams per second.
Higher bitrate means better quality (less compression), but higher network usage (which means you need a better internet connection).
For example a 20 Mbps bitrate steam requires at least a 20 Mbps download speed to not get the stream to stop every few seconds (AKA buffering).
Watching the same movie in 1080p and 4K while being uncompressed (or compressed by the same amount) will look almost the same at on a 1080p monitor.
Streaming services usually stream 1080p content at a lower bitrate to allow everyone, including people with very slow internet connections, to watch their content.
4K on the other hand usually gets a big bitrate boost (besides what’s added because of the increase in resolution) since people with slow connection can just switch to 1080p, but people who care about watching at 4K usually care about quality, hence the higher bitrate and the far superior quality.
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