Zirconia, or zirconium dioxide (ZrO2), is a white crystalline oxide of zirconium. It is known for its high strength, durability, and resistance to heat and corrosion. Due to these properties, zirconia is widely used in various applications, including dental ceramics, cutting tools, and as a refractory material in high-temperature environments. In dentistry, zirconia is popular for creating crowns and bridges because it mimics the appearance of natural teeth and is biocompatible. Additionally, zirconia is used in the production of oxygen sensors and fuel cells, showcasing its versatility in both medical and industrial fields.