Chlorine is a greenish-yellow gas that is commonly used for disinfecting water and cleaning surfaces. It is a member of the halogen group in the periodic table and has the chemical symbol Cl. Chlorine is known for its strong smell and is often associated with swimming pools, where it helps keep the water safe by killing harmful bacteria. In addition to its use in water treatment, chlorine is also found in many household cleaning products. It plays a crucial role in the production of various chemicals, including bleach and PVC (polyvinyl chloride), which is used in plumbing and construction. Chlorine is essential for maintaining hygiene and safety in our daily lives.