Chlorinated compounds are chemical substances that contain chlorine atoms bonded to carbon. They are commonly used in various applications, including solvents, pesticides, and plastics. Some well-known examples include chlorofluorocarbons (CFCs), which were once used in refrigeration and aerosol sprays, and dichlorodiphenyltrichloroethane (DDT), a pesticide. These compounds can be harmful to the environment and human health. Many chlorinated compounds are persistent in nature, meaning they do not break down easily and can accumulate in living organisms. This persistence raises concerns about their potential effects on ecosystems and the food chain.