What is the door wing

The door leaf is the most visible part of the door mechanism. This part is frameless and movable.
The basic division is on the right and left wing depending on which side opens. However, there are also
sliding, swing and folding doors. The materials used for the production are different. The standard is
wood, but relatively common are today also armored entrance doors, which are very tangible and
must be attached to special hinges.