Tuff is a type of volcanic rock formed from the ash and debris ejected during explosive volcanic eruptions. It is typically light and porous, making it easy to work with in construction and landscaping. Tuff can vary in color, often appearing in shades of gray, brown, or green, depending on its mineral content. This rock is commonly used in building materials, such as bricks and tiles, due to its insulating properties. Tuff is also found in various geological formations around the world, including regions near active volcanoes like Mount St. Helens and Mount Vesuvius.