Selenium dioxide is a chemical compound with the formula SeO2. It appears as a white or yellowish solid and is primarily used in various industrial applications, including the production of glass and ceramics. Selenium dioxide is also utilized in organic synthesis as an oxidizing agent. In nature, selenium dioxide can be formed from the oxidation of elemental selenium. It is important to handle this compound with care, as it can be toxic and harmful if ingested or inhaled. Proper safety measures should be taken when working with selenium dioxide in laboratory or industrial settings.