Copper compounds are chemical substances that contain the element copper combined with other elements. They can be found in various forms, such as copper(II) sulfate, copper(II) oxide, and copper(I) chloride. These compounds are often used in agriculture as fungicides and in industry for electrical wiring and plumbing. Many copper compounds exhibit vibrant colors, making them useful in art and decoration. For example, copper(II) sulfate is bright blue, while copper(I) oxide appears red. Additionally, some copper compounds play a role in biological processes, as copper is an essential trace element for living organisms.