Cu, or copper, is a reddish-brown metal known for its excellent electrical and thermal conductivity. It is a ductile and malleable material, making it easy to shape into wires and other forms. Copper is commonly used in electrical wiring, plumbing, and various industrial applications due to its durability and resistance to corrosion. In nature, copper is often found in minerals such as chalcopyrite and malachite. It has been used by humans for thousands of years, dating back to ancient civilizations. Today, copper is an essential component in many technologies, including electronics and renewable energy systems like solar panels.