Sodium bisulfite is a chemical compound with the formula NaHSO₃. It appears as a white crystalline powder and is commonly used as a food preservative and antioxidant. In the food industry, it helps prevent browning in fruits and vegetables and is often found in dried fruits and wines. In addition to its culinary uses, sodium bisulfite is utilized in various industrial applications, including water treatment and photography. It acts as a reducing agent, helping to remove chlorine from water and stabilize photographic solutions. Its versatility makes it an important compound in both food and industrial sectors.