Titanium dioxide (TiO2) is a naturally occurring oxide of titanium with the chemical formula TiO2. It is commonly used as a white pigment in a variety of products, including paints, coatings, plastics, paper, inks, cosmetics, and food. Titanium dioxide is known for its brightness and high refractive index, which makes it an ideal pigment for achieving opacity and enhancing the whiteness and brightness of products.