Positive Correlation: This occurs when both variables increase or decrease together, like height and weight in humans - as height increases, typically so does weight.
Negative Correlation: This happens when one variable increases while the other decreases, like time spent watching TV and grades - as TV time goes up, grades often go down.
Correlation Coefficient: A statistical measure that calculates the strength and direction of a correlation. It's like a scorecard telling how closely two things are related.