Malic acid is a naturally occurring organic acid found in many fruits, including apples, cherries, and grapes. It is widely used in the food industry as a flavor enhancer, pH regulator, and preservative. As a flavor enhancer, malic acid is used to give foods a sour or tart taste. It can also help to enhance the flavor of other ingredients, such as fruit flavors in beverages and candies. Malic acid is also used as a pH regulator, helping to adjust the acidity of food products.