A double-blind study is a research method used to eliminate bias in experiments. In this type of study, neither the participants nor the researchers know who is receiving the treatment and who is receiving a placebo. This helps ensure that the results are not influenced by expectations or beliefs. These studies are commonly used in clinical trials for new medications or therapies. By keeping both parties unaware, researchers can obtain more reliable data about the effectiveness and safety of the treatment being tested, leading to more accurate conclusions about its impact on health.