A sulfide is a chemical compound that consists of sulfur and one or more metals or nonmetals. In these compounds, sulfur typically has a -2 oxidation state, meaning it gains two electrons. Sulfides can be found in various forms, including minerals and industrial materials, and they often have distinct properties, such as being insoluble in water. Sulfides are important in various fields, including geology and chemistry. For example, metal sulfides like copper sulfide and zinc sulfide are significant in mining and metallurgy. Additionally, some sulfides, such as hydrogen sulfide, are known for their strong odors and can be toxic in high concentrations.