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A bridge is a structure designed to span physical obstacles, such as rivers, valleys, or roads, and provide a passage over them. Bridges can be constructed of various materials, including steel, concrete, wood, or stone, and their designs can vary widely depending on their purpose and location. Bridges can be classified into several types, such as beam bridges, arch bridges, suspension bridges, cable-stayed bridges, and truss bridges. Each type of bridge has its unique features and characteristics that make it suitable for particular situations. Beam bridges are the simplest and most common type of bridge, consisting of horizontal beams supported by vertical columns or piers. Arch bridges use curved arches to support the weight of the bridge deck and distribute it evenly across the bridge's abutments. Suspension bridges use cables suspended from towers to support the bridge deck, while cable-stayed bridges use cables that are anchored directly to the bridge's piers or towers. Truss bridges are a type of beam bridge that uses a framework of interconnected triangles to distribute weight and provide support. Truss bridges can be further classified into several subtypes, such as Pratt truss, Warren truss, and Howe truss, based on their specific truss designs. Bridges play a crucial role in transportation infrastructure, enabling people and goods to move over waterways and other obstacles efficiently and safely. They are also often architectural and engineering marvels, attracting visitors from around the world who appreciate their aesthetic and functional qualities.