Truss
A truss bridge is a bridge that relies on its cross sections to provided strength and the frame around it. It is reasonably strong
Arch
The arch bridge gets its strength from the arch which disperses the weight or load. It also has beams like the truss bridge for extra strength. It is stronger then the truss bridge.
Suspension
The suspension bridge is suspended by wires the drop down from another wire. It supports medium loads and is used to travel long distances.