Selenium is widely used in the electronics industry, particularly in the manufacturing of semiconductor devices, photocells, photocopiers, and laser printers due to its photoconductive properties. It plays a key role in solar panels, enabling the conversion of light into electrical energy.

Selenium is also used as a pigment in ceramics, glass, and plastics, providing red and orange colors. In glass production, it helps decolorize glass by counteracting iron impurities or impart a deep red hue, depending on the application.

It is added to stainless steel, brass, and other alloys to improve machinability. In the rubber industry, selenium enhances flexibility and heat resistance.

In small amounts, selenium is an essential nutrient in dietary supplements and animal feed, supporting antioxidant functions, immune system performance, and enzyme activity in the body. Additionally, selenium compounds are used in some types of anti-dandruff shampoos due to their antifungal properties.