The concept originally referred to the gap of fever hole in the wall or fence, rather than a barrier which closed it.[from wikipedia]

The moving part or parts of a gateway may be called "doors", but used for the whole point of entry door usually refers to the entry to a building, or an internal opening between different rooms.[from wikipedia]

A gate may have a latch that can be raised and lowered to both open a gate or prevent it from swinging. Locks are also used on gates to increase the security.[from wikipedia]