Correlation can also be called association. When a correlation is found between two variables, it is normally presumed that one causes another. But it is not the case always. In statistics there are lot more variables that should taken into account.
For example we go with a studyChildren who eat breakfast have higher grades, so eating breakfast causes higher grades.
There may be a third factor causing both higher grades and eating breakfast such as more responsible and loving parents who help children with homework as well as make sure they eat breakfast. Causation can only be inferred from a randomised experiment.
The below video gives a complete explanation of correlation and causation and other things that should taken into consideration before jumping into conclusions.
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