Sodium nitrite is a chemical compound with the formula NaNO2. It appears as a white or yellowish crystalline powder and is commonly used as a food preservative, particularly in processed meats like bacon and hot dogs. Its primary function is to inhibit the growth of harmful bacteria and to enhance the color and flavor of the food. In addition to its use in food, sodium nitrite has applications in various industries, including the production of dyes and pharmaceuticals. It is also used in the manufacturing of nitric oxide, a compound important for various biological processes. However, sodium nitrite must be handled with care, as it can be toxic in high doses.