Al2O3, commonly known as alumina, is a chemical compound made up of aluminum and oxygen. It appears as a white, odorless powder and is widely used in various industries due to its hardness and resistance to corrosion. Alumina is a key component in the production of aluminum metal and is also used in ceramics, abrasives, and as a catalyst in chemical reactions. In nature, Al2O3 occurs as the mineral corundum, which can be found in gemstones like sapphire and ruby. Its high melting point and thermal stability make it suitable for applications in high-temperature environments. Additionally, Al2O3 is used in the manufacturing of electrical insulators and as a filler in various products.