This is a frequently asked question both here and on the other question-asking subreddits, I am surprised you have not found the answer already.
In either case the computer needs resources such as memory/RAM and processor/CPU to do the tasks it is being asked. The main difference is that, since a game does not have linear progression, the computer must store all the possible progression paths in memory, then render them as they are chosen. Compared to a video, which is linear (no decisions are made during the video that could alter what would be shown) so there’s only 1 path to process.
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