Copper oxides are chemical compounds formed when copper reacts with oxygen. The two most common types are copper(I) oxide (Cu2O) and copper(II) oxide (CuO). These compounds are typically found as dark-colored solids and are used in various applications, including electronics, ceramics, and as pigments. In addition to their industrial uses, copper oxides also play a role in environmental science. They can be involved in processes like catalysis and are studied for their potential in solar energy applications. Their unique properties make them valuable in both research and practical uses.