Imagine you have to move furniture from 1 room to another that is 16GB. Between these rooms is another room of the same “surface” of 16GB.
When moving the furniture, it’s very convenient to have such a large room to move them around before you can push them into the final room in the position that is the best fit.
But once the furniture are in the last room, you realize that the room get filled quite fast and gets cramped.
That’s because the middle room was just for the transit, and you thought it was large enough, but the last room is where you have to stock your furniture, and you realize it’s not that big if you have to put everything in there indefinitely.
So RAM is the transit room, and an SD card is the last room, where the data stay.
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