Lactic acid is an organic acid with the formula C3H6O3, occurring naturally in various foods, particularly in fermented products like yogurt and sauerkraut. It is produced in the body during anaerobic respiration and is a key intermediate in carbohydrate metabolism. Lactic acid contributes to the sour taste of fermented foods and is used as a preservative and flavoring agent. It has applications in the food industry, cosmetics, and pharmaceuticals due to its moisturizing properties. Lactic acid is recognized for its role in enhancing the texture and flavor of food products, and it is also used in various health and beauty products for its exfoliating properties.