Chloride is a chemical compound that contains the element chlorine in its ionic form, typically represented as Cl-. It is commonly found in nature, especially in saltwater, where it combines with sodium to form sodium chloride, or table salt. Chloride plays a vital role in various biological processes, including maintaining fluid balance in the body and supporting nerve function. In addition to its biological importance, chloride is used in many industrial applications. It is essential in the production of chlorine gas, which is used for disinfecting water and making various chemicals. Chloride compounds are also found in fertilizers, helping to promote plant growth.