Control Group: A group in an experiment that does not receive the treatment being tested. It is used for comparison purposes to evaluate the effects of the treatment.
Experimental Group: A group in an experiment that receives the treatment being tested. It allows researchers to assess whether there are any differences between groups due to the treatment.
Variables: Factors that can be measured or manipulated in research. They can be independent variables (manipulated by researchers) or dependent variables (measured as outcomes).