Selenium 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 exist in various forms, including selenium dioxide and selenium sulfide, and they are used in a range of applications, from electronics to agriculture. Selenium is essential for human health in small amounts, as it plays a role in metabolism and antioxidant defense. In addition to their health benefits, selenium compounds are also utilized in industrial processes. For example, selenium sulfide is commonly used in anti-dandruff shampoos due to its antifungal properties. Overall, selenium compounds are important in both biological and industrial contexts, highlighting their versatility and significance.