Every time it rains my basement floods.
Every time it rains my neighbor wears his rain boots.
My basement flooding does not cause my neighbor to wear rain boots. Likewise my neighbor wearing rain boots doesn’t cause my basement to flood. There is no causation between them. But they are correlated, they appear to happen at the same time. In this case there is an underlying cause (the rain) that connects them both. Sometimes that causes is obvious. Sometimes it’s more subtle or indirect. Sometimes there’s no connection at all, it’s just coincidence.
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