Sodium benzoate is the sodium salt of benzoic acid, a naturally occurring compound found in fruits such as cranberries, prunes, and apples. It is typically white, crystalline powder that is soluble in water and has a slightly sweet flavor. Due to its antimicrobial properties, E211 is often added to acidic foods and beverages, such as salad dressings, carbonated drinks, and sauces, to prevent spoilage and maintain quality.