Arsenic Trioxide is a chemical compound composed of arsenic and oxygen, often found in nature as a mineral. It appears as a white or yellowish powder and is primarily used in the production of glass and pesticides. However, it is also known for its toxic properties, which can pose serious health risks to humans and the environment. In medicine, Arsenic Trioxide has gained attention for its use in treating certain types of cancer, particularly acute promyelocytic leukemia (APL). It works by inducing cancer cell death and is often used in combination with other therapies. Despite its effectiveness, careful handling and monitoring are essential due to its potential toxicity.