TeO3, or tellurium trioxide, is a chemical compound composed of one tellurium atom and three oxygen atoms. It is typically found as a white crystalline solid and is known for its use in various chemical applications, including as a precursor in the production of tellurium-based materials. In terms of its properties, TeO3 is hygroscopic, meaning it can absorb moisture from the air. It is also a strong oxidizing agent, which makes it useful in chemical reactions that require the addition of oxygen. Its applications extend to fields such as semiconductors and glass manufacturing.