Barges are flat-bottomed boats designed primarily for transporting goods on rivers and canals. They are often towed or pushed by tugboats and can carry large amounts of cargo, including coal, grain, and other bulk materials. Their shallow draft allows them to navigate in shallow waters, making them ideal for inland waterways. Typically made of steel or aluminum, barges come in various sizes and types, including tank barges for liquids and hopper barges for bulk materials. They play a crucial role in the shipping industry, providing an efficient and cost-effective means of moving goods over water.