Final answer:
Correlation is the association between variables where a change in one variable is linked to a change in another. It can be linear or nonlinear.
Explanation:
Correlation is the association between variables in which a change in one variable is linked to a change in another variable. The relationship between two or more variables shows how one variable changes as the other changes. In some cases, this relationship can be linear, where the variables change proportionally, while in others, it can be nonlinear, with varying rates of change.
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