Fumaric acid is a naturally occurring organic compound with the chemical formula C4H4O4. It is a dicarboxylic acid that plays a role in the Krebs cycle, a key metabolic pathway in living organisms. Fumaric acid is found in various plants, including mushrooms and lichens, and is used in food and beverage industries as a flavoring agent and acidity regulator. In addition to its culinary uses, fumaric acid is also utilized in the production of resins, plastics, and pharmaceuticals. It has been studied for its potential therapeutic effects in treating conditions like multiple sclerosis and psoriasis, highlighting its importance in both industrial and medical fields.