Randomization is a process used in research and experiments to assign subjects to different groups in a way that is entirely based on chance. This method helps ensure that each group is similar in characteristics, reducing bias and allowing for more reliable results. By randomly assigning participants, researchers can better isolate the effects of the treatment or intervention being studied. In clinical trials, for example, randomization helps determine the effectiveness of a new drug by comparing it to a placebo. This approach minimizes the influence of confounding variables, making it easier to draw valid conclusions about the treatment's impact on health outcomes.