The chemical element represented by the symbol 'Cl' is chlorine. Chlorine is a halogen and is found in Group 17 of the periodic table. This element is essential in various chemical processes, particularly in the production of disinfectants, bleaches, and other industrial chemicals. Chlorine is commonly used in water treatment to eliminate bacteria and impurities, ensuring safe drinking water. It is also a key component in the manufacturing of various chlorinated compounds, including PVC and solvents. Chlorine's distinct properties and reactivity make it a critical element in both chemical and environmental applications.