Cantilever
A cantilever is a beam only anchored at one end. This beam carries stuff to a support where the force is pushing by a movement and sheer stress. Cantilevers are also constructed using trusses or slabs.
![Picture](/uploads/5/0/7/1/50715611/615155110.jpg?250)
Why it is important
They are important because they keep bridges attached and balconies. It is built in pairs for the bridge and same with balconies. Other examples of cantilevers are a diving board and a plane wing.
Photo used under Creative Commons from bobarcpics