Calcium oxide, commonly known as quicklime, is a white, caustic solid that is produced by heating limestone in a process called calcination. It is widely used in various industries, including construction, where it serves as a key ingredient in making cement and mortars. When mixed with water, calcium oxide reacts to form calcium hydroxide, which is useful in water treatment and soil stabilization. In addition to its industrial applications, calcium oxide plays a role in agriculture as a soil amendment, helping to improve soil pH and nutrient availability. It is also used in the production of glass and ceramics, showcasing its versatility in different fields.