Tuff is a type of rock formed from volcanic ash that has compacted and solidified over time. It is often light and porous, making it easier to carve and shape than many other types of stone. Tuff can vary in color, typically appearing in shades of gray, brown, or green, depending on its mineral content. This rock is commonly found in areas with volcanic activity, such as Italy and the western United States. Tuff has been used in construction for centuries, notably in ancient structures like the Colosseum in Rome. Its unique properties make it a popular choice for both building and artistic purposes.