SeO2, or selenium dioxide, is a chemical compound composed of selenium and oxygen. It appears as a white or yellowish solid and is primarily used in the production of glass, ceramics, and as a reagent in various chemical reactions. Selenium dioxide is known for its ability to oxidize organic compounds, making it valuable in organic chemistry. In addition to its industrial applications, SeO2 is also studied for its potential use in pharmaceuticals and as a catalyst in chemical processes. It is important to handle selenium dioxide with care, as it can be toxic and harmful to health if ingested or inhaled.