A randomized trial is a type of research study in which participants are randomly assigned to different groups in order to compare the effects of different treatments, interventions, or strategies. This method is often used in clinical trials to evaluate the effectiveness of new drugs or medical treatments, but it can also be used in other fields such as psychology, education, and social sciences. By randomly assigning participants to different groups, researchers can help minimize bias and ensure that the results of the study are valid and reliable. Randomized trials are considered the gold standard for evaluating the effectiveness of interventions because they are able to establish causal relationships between the treatment and outcomes.