Brass is an alloy of copper and zinc. An alloy is a combination of two or more metals, or a metal and a non-metal. In the case of brass, copper is the main metal and zinc is the other component. The proportion of copper to zinc can vary, resulting in different types of brass with varying properties. Brass is known for its attractive golden appearance and is widely used in the production of decorative items, musical instruments, and plumbing fixtures, among other things.