**Correlation:** In marketing, correlation is a statistical measurement that describes the relationship between two variables. It is used to understand the influence of one variable on another. A positive correlation means that both variables move in the same direction, a negative correlation means they move in opposite directions. Correlation helps marketers analyze data and predict future trends or behaviors. However, it’s important to remember the principle that correlation does not imply causation - just because two variables correlate does not mean that one directly causes the other to occur.