Experiments are structured procedures used to test hypotheses or explore scientific questions. They involve manipulating one or more variables while keeping others constant to observe the effects. This method helps researchers gather data and draw conclusions about cause-and-effect relationships. In scientific research, experiments can take many forms, such as laboratory tests, field studies, or clinical trials. Each type aims to provide reliable results that can be replicated by others. By using experiments, scientists like Isaac Newton or Marie Curie have made significant discoveries that advance our understanding of the world.