Chemical preservatives are substances added to food and other products to prevent spoilage and extend shelf life. They work by inhibiting the growth of bacteria, molds, and yeasts, which can cause food to decay. Common examples include sodium benzoate and sorbic acid, which are often found in beverages and baked goods. These preservatives help maintain the quality and safety of products, allowing them to be stored for longer periods without losing flavor or nutritional value. While they are generally recognized as safe by regulatory agencies, some consumers prefer to avoid them due to health concerns or dietary choices.