Sheet piles are long, vertical sections of material, usually made of steel, concrete, or wood, that are driven into the ground to create a barrier. They are commonly used in construction and civil engineering to support excavations, retain soil, and prevent water infiltration. These piles are installed closely together to form a continuous wall, which helps to stabilize the surrounding area. Sheet piles are often used in projects like docks, harbors, and retaining walls, providing essential support and protection against erosion and flooding.