In aviation, the groundcrew is the support crew supplying the aircraft with fuel and maintenance, as opposed to the aircrew.
In airlines, ground crew members include:
Some ground crew members are responsible for clearing the runway and gate area of any debris or garbage, in order to prevent foreign object damage by an object being sucked into an engine. The crew visually inspects the tarmac and removes any items found; this is typically called a "FOD Walk" and is done prior to aircraft arrival and departure.