Chlorine dioxide, or ClO2, is a chemical compound composed of one chlorine atom and two oxygen atoms. It is a yellowish-green gas at room temperature and is known for its strong oxidizing properties. ClO2 is commonly used as a disinfectant in water treatment processes, helping to eliminate bacteria, viruses, and other pathogens. In addition to its use in water purification, ClO2 is also employed in various industrial applications, such as bleaching paper and textiles. Its effectiveness as a disinfectant makes it a valuable tool in maintaining hygiene in healthcare settings and food processing facilities.