Klor is a chemical element with the symbol Cl and atomic number 17. It is a greenish-yellow gas at room temperature and is part of the halogen group in the periodic table. Klor is highly reactive and is commonly found in nature as part of various compounds, such as sodium chloride or table salt. In its elemental form, klor is used for disinfection and sanitation, particularly in water treatment processes. It helps eliminate harmful bacteria and viruses, making water safe for drinking. Additionally, klor is utilized in the production of various chemicals and plastics, highlighting its importance in both health and industry.