Selenium oxides are chemical compounds formed when selenium reacts with oxygen. The most common oxides are selenium dioxide (SeO2) and selenium trioxide (SeO3). These compounds are typically produced through the combustion of selenium-containing materials and can be found in various industrial processes. Selenium oxides are important in the field of chemistry and materials science. They can be used in the production of selenium-based compounds and have applications in electronics, glass manufacturing, and as catalysts. However, they can also be toxic, necessitating careful handling and regulation.