The term "stained glass" refers to a type of artwork that is created by cutting and painting colored glass pieces, which are then assembled into intricate designs or patterns. The name comes from the fact that the colors in the glass are produced by adding metallic salts during the manufacturing process, resulting in a rich, vibrant hue when light passes through it. Stained glass is often associated with religious artwork and can be found in churches, cathedrals, and other places of worship. It's also used for decorative purposes in homes or public buildings.