Fumaric acid is a naturally occurring organic compound with the chemical formula C4H4O4. It is a colorless, crystalline substance that is commonly found in various plants, including mushrooms and fermented foods. Fumaric acid plays a role in the Krebs cycle, a vital metabolic pathway that helps produce energy in living organisms. In addition to its natural occurrence, fumaric acid is used in various industrial applications, such as food additives and pharmaceuticals. It can enhance the flavor of certain foods and is also utilized in the production of resins and plastics. Its versatility makes it an important compound in both natural and synthetic processes.