Selen, with the chemical symbol Se, is an essential trace element discovered in 1817 by the Swedish chemist Jöns Jacob Berzelius. Belonging to the group of chalcogens, selenium is present on Earth in small amounts, approximately 0.05 ppm in the Earth's crust. It often occurs in metal selenides, and some soils may contain trace amounts of selenium.

The applications of selenium are diverse. It is used in the glass industry to produce red colors and in photography as a component of photovoltaic cells. Selenium also plays a crucial role in biology, serving as an essential trace element for many living organisms.

In the future, potential applications of selenium could be found in technology and medicine. Selenium-based compounds are extensively researched, particularly in the context of solar technologies and as potential antioxidants in medicine.

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