Selenium-based compounds are chemical substances that contain the element selenium, which is a non-metal found in group 16 of the periodic table. These compounds can take various forms, including selenium dioxide and selenium sulfide, and are used in a range of applications, from agriculture to pharmaceuticals. They are known for their antioxidant properties and potential health benefits. In agriculture, selenium-based compounds are often used as fertilizers to enhance soil quality and improve crop yield. In medicine, they are studied for their role in preventing certain diseases and supporting immune function. Overall, selenium-based compounds play a significant role in both environmental and health-related fields.