Cobalt is a chemical element with the symbol Co and atomic number 27. It is a hard, lustrous, gray metal that is found naturally in the Earth's crust, often combined with other elements in minerals. Cobalt is primarily used in the production of batteries, particularly lithium-ion batteries, which power many electronic devices and electric vehicles. In addition to its role in batteries, cobalt is also used to create strong alloys and is an essential component in the production of superalloys for jet engines. It is important in the manufacturing of catalysts and pigments, giving a vibrant blue color to glass and ceramics.