A Placebo is anything which seems to be the real" medical treatment but is not in actual. It could be in the form of a pill, a shot, or any other type of a fake treatment. The thing that all the placebos have in common is that they do not consist of an active substance that is meant to affect health.Researchers use the placebos during their studies to help them understand better about what effect the new drug or some other kind of treatment might have on a specific condition.For instance, some people in the study may be given the new drug to lower the levels of cholesterol. Others would get the placebo. None of these people in the study would know if they got the actual real treatment or the placebo.Researchers then compare the different effects of the drug and the placebo on these people in the study. This way, they can know about the effectiveness of the new drug and then check for side effects if there are any.