An experiment is a scientific procedure carried out to test a hypothesis or demonstrate a known fact. It involves manipulating one or more variables while keeping others constant to observe the effects. This method is fundamental in fields like biology, chemistry, and physics, allowing researchers to gather data and draw conclusions. Experiments can be conducted in controlled environments, such as laboratories, or in natural settings. They often include a control group, which does not receive the experimental treatment, to provide a baseline for comparison. The results help scientists understand relationships between variables and contribute to the advancement of knowledge.