A food additive is a substance added to food to enhance its flavor, appearance, or preservation. These additives can be natural, like salt or sugar, or synthetic, such as artificial colors and preservatives. They help improve the shelf life of products and maintain their quality during storage and transportation. Food additives are regulated by government agencies, such as the U.S. Food and Drug Administration (FDA), to ensure they are safe for consumption. Common examples include emulsifiers, which help mix ingredients, and antioxidants, which prevent spoilage. Understanding food additives can help consumers make informed choices about their diets.