Experimental methods are systematic approaches used in research to test hypotheses and gather data. These methods often involve manipulating one or more variables while keeping others constant to observe the effects. For example, a scientist might change the amount of light a plant receives to see how it affects growth. This helps establish cause-and-effect relationships. In addition to laboratory experiments, researchers may also use field experiments, which take place in natural settings. This allows them to study real-world conditions. Both types of experiments are essential in fields like psychology, biology, and chemistry, helping to advance our understanding of various phenomena.