Oxides constitute a major class of inorganic chemical compounds, defined by the chemical bonding of oxygen to a metallic or semi-metallic element. Due to the vast number of possible combinations, their properties—including stability, conductivity, and physical state—vary immensely. Chemically, they are foundational to the study of geochemistry and mineral formation, playing essential roles in the cycles of elements within the Earth's crust. In physical science and technology, oxides are frequently utilized in material science for creating ceramics, advanced catalysts, and protective coatings. They are also integral to various chemical reactions, acting both as reactants and as the sources of fundamental chemical properties.