Metal sulfides are compounds formed when metal elements bond with sulfur. They are typically characterized by their distinct properties, such as conductivity and varying colors. Common examples include copper sulfide and zinc sulfide, which are often found in nature as minerals. These compounds play a significant role in various industries, including mining and electronics. Metal sulfides can be used in the production of semiconductors and as catalysts in chemical reactions. Additionally, they are important in the extraction of metals from ores, making them valuable in resource recovery and environmental applications.