Sodium nitrite, or NaNO2, is a chemical compound made up of sodium, nitrogen, and oxygen. It appears as a white to yellowish crystalline powder and is highly soluble in water. NaNO2 is commonly used in food preservation, particularly in cured meats, where it helps prevent bacterial growth and enhances flavor. In addition to its use in food, NaNO2 has applications in various industries. It is utilized in the production of dyes, as a corrosion inhibitor in cooling systems, and in the synthesis of other chemicals. However, it must be handled with care, as it can be toxic in high doses.