Calcium carbonate (CaCO₃) is a mineral compound widely found in nature in the form of limestone, marble, and chalk. Thanks to its favourable physical and chemical properties, it has extensive applications across various industries. In construction, it is used in the production of cement and lime; in steelmaking, it acts as a flux; and in agriculture, it is applied for soil improvement and pH adjustment. In medicine, it serves as an effective antacid. Calcium carbonate is safe, readily available, and cost-effective, holding a vital role in both industry and everyday life.