An empirically observed correlation between two independent variables is necessary, but not a sufficient condition for causality. Correlation is not causation, it just signifies a relationship/comparison between two different things. A positive correlation is two things going the same way (up or down); an inverse correlation is two things going opposite directions. I know this is a mouthful, but its the basic definition on the top of my head.
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An empirically observed correlation between two independent variables is necessary, but not a sufficient condition for causality. Correlation is not causation, it just signifies a relationship/comparison between two different things. A positive correlation is two things going the same way (up or down); an inverse correlation is two things going opposite directions. I know this is a mouthful, but its the basic definition on the top of my head.