A crane is a type of heavy machinery commonly used in construction and other industries for lifting and moving heavy objects. It typically consists of a tall, vertical mast or tower with a rotating arm, called a boom, which can be extended or retracted as needed. The boom is equipped with a hoist and cables, allowing the crane to lift and lower loads with precision and control. Cranes are essential for tasks such as building skyscrapers, assembling large structures, and transporting heavy materials on construction sites.