Final answer:
A correlation is when one factor is only related, or associated, with another factor. It does not imply a cause-and-effect relationship between the two variables.
Step-by-step explanation:
When one factor is only related, or associated, with another factor it is called a correlation. Correlation is an association between two variables in which a change in one variable is associated with a change in the other variable. It does not imply a cause-and-effect relationship between the two variables.