Sodium metabisulfite is a commonly used substance in various industries. It is mainly used as a preservative and a disinfectant for food and beverages. It is also used as a reducing agent in chemical reactions. This chemical compound is also known by several other names, including sodium pyrosulfite, sodium disulfite, disodium disulfite, and pyrosulfurous acid. These names are all synonyms for sodium metabisulfite and are used interchangeably in various industries. Regardless of the name, this compound plays a vital role in many applications, including water treatment, photographic processing, and bleaching. Its versatility and effectiveness make it an essential component in many industrial processes.