Selenium is widely used in the electronics industry, especially in the production of semiconductor devices, photocells, photocopiers, and laser printers. It plays a key role in solar panels due to its photoconductive properties, helping convert sunlight into electricity.

Selenium is also used as a coloring agent in glass manufacturing, where it can decolorize glass by removing green tints caused by iron impurities or give it a deep red or pink hue, depending on the form and concentration used.

In metallurgy, selenium improves the machinability of certain metal alloys, particularly in copper and lead alloys. It is added in small amounts to enhance the performance and durability of these materials.

Selenium compounds are also used in some types of anti-dandruff shampoos due to their antifungal properties, helping reduce scalp flaking and irritation.

In the rubber industry, selenium is sometimes used as a catalyst for removing excess sulfur after rubber extrusion, improving flexibility and product lifespan.

Additionally, selenium is an essential trace element in biological systems and is included in dietary supplements, vitamins, and animal feed to support antioxidant enzyme function, immune system performance, and overall health. However, its use in nutrition is carefully controlled due to the narrow margin between beneficial and toxic levels.