Burnt lime, also known as quicklime, is a white, caustic solid made by heating limestone in a kiln. This process, called calcination, removes carbon dioxide, resulting in a highly reactive material primarily composed of calcium oxide (CaO). Burnt lime is used in various industries, including construction, where it serves as a key ingredient in cement and mortar. In addition to construction, burnt lime plays a vital role in environmental applications, such as water treatment and soil stabilization. It can also be used in the production of glass and steel, helping to remove impurities and improve the quality of these materials.