Malic acid is a naturally occurring organic compound that belongs to the class of dicarboxylic acids. It is found in various fruits, particularly in apples, and contributes to their tart taste. The chemical formula for malic acid is C4H6O5.

In addition to its presence in fruits, malic acid is commonly used as a food additive for its sour flavor, acting as an acidulant in the food and beverage industry. It is also utilized in the production of certain candies and beverages to enhance their taste. Beyond its applications in the food industry, malic acid has various uses, including in cosmetic and pharmaceutical products due to its acidifying and antioxidant properties.

Moreover, malic acid plays a role in the Krebs cycle, a fundamental process in cellular respiration, making it relevant in biological systems. It is available in different forms, including L-malic acid and DL-malic acid, each with specific applications. Overall, malic acid serves as a versatile compound with applications in various industries.