Copper sulfides are a group of chemical compounds composed of copper and sulfur. They are commonly found in nature as minerals, such as chalcopyrite and bornite, and are important sources of copper for industrial use. These compounds typically exhibit metallic luster and can vary in color from yellow to dark brown. In addition to their role in copper extraction, copper sulfides have applications in electronics and materials science. They can be used in the production of semiconductors and photovoltaic cells, contributing to advancements in technology and renewable energy solutions.