Everyone provided the long explanation of this pretty well but to understand it more, understand storage and memory (RAM) are two completely different things.
Both are measured the same way (MB, GB, TB, etc.) but storage is used to keep the files that make up a game on your computer. Memory is used by a computer to do multiple things at a time without slowing down. So a game can *function* with 4GB. but to be able to run with a certain expectation of quality it would need more.
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