Citric acid is a natural organic acid found in citrus fruits like lemons and oranges. It is commonly used as a preservative and flavoring agent in food and beverages due to its sour taste. In addition to its culinary uses, citric acid plays a role in the Krebs cycle, a key metabolic pathway that helps produce energy in living organisms. In the household, citric acid is often used for cleaning purposes because of its ability to break down mineral deposits and stains. It is also a popular ingredient in cosmetics and pharmaceuticals for its antioxidant properties. Overall, citric acid is a versatile compound with various applications.