A drawbridge is a type of movable bridge that can be raised or lowered to allow boats and ships to pass through. It typically consists of a deck that pivots or lifts, creating an opening in the middle. Drawbridges are commonly found in areas with waterways, where they help manage both road and water traffic. These bridges can be operated manually or automatically, often using a system of gears and motors. Drawbridges are essential for maintaining transportation routes while accommodating the needs of maritime navigation, making them important structures in cities with rivers or canals, such as Amsterdam or Venice.