Question: Capture Card vs Scrcpy

So This little question popped up in my mind, what is the difference between using a video capture card and scrcpy?
So I know that people use capture cards to avoid putting extra stress on their devices and get that 1 extra fps that they weren't getting but how to does scrcpy work? Does this use any processors? I know that an apps runs in the background of the phone, it also requires to have the debugging mode on, I also noticed that there's a bit delay between the actual screen and the display that scrcpy shows, but let's say someone uses a video capture card and scrcpy on low-mid end phone to record a game let's PUBG what are the differences gonna be between those two recordings?

The issue mentions no files, tests, or entry points. First review scrcpy's user-facing documentation and its Android display and recording explanations; done would be a clear comparison of scrcpy and a capture card, including processing load, latency, and recording differences.

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