As2O3, also known as arsenic trioxide, is a chemical compound made up of two arsenic atoms and three oxygen atoms. It appears as a white or yellowish powder and is primarily used in the production of glass and ceramics. Additionally, it has applications in the pharmaceutical industry, particularly in the treatment of certain types of leukemia. Arsenic trioxide is toxic and can pose health risks if ingested or inhaled. It is classified as a carcinogen, meaning it can potentially cause cancer. Proper safety measures are essential when handling this compound to prevent exposure and ensure safe usage in industrial and medical settings.