This is the name for those Aircraft that had a particular wing structure - i.e. two pairs of wings.
There is no specific role or user set to aircraft of this configuration.
Early Aircraft (Usually Propeller Aircraft) could not always get sufficient lift from a single wing without that wing becoming structurally unsound. One solution to this was to create an aircraft with multiple wings. This shortened the wingspan, and that had a great advantage in early combat by warplanes.