Metal sulfides are compounds formed by the combination of metal elements with sulfur. They are typically characterized by their distinct properties, such as conductivity and varying levels of hardness. Common examples include copper sulfide and zinc sulfide, which are often found in nature as minerals. These compounds play significant roles in various industries, including mining and electronics. Metal sulfides can be used in the production of semiconductors and batteries, as well as in the extraction of metals from ores. Their unique chemical properties make them valuable in both industrial applications and scientific research.