Pilot is your skill at driving/flying a vehicle of a particular type.

You use Pilot skill whenever you need to maneuver, control, or avoid crashing a vehicle, whether you are in the pilot’s seat, remote controlling a robot, or directly jamming a vehicle with VR. Each vehicle has a Handling modifier that applies to this test, along with other situational modifiers (see Bots, Synthmorphs, and Vehicles, p. 195).

Pilot is a field. It requires a particular area of expertise to be selected. Examples include Aircraft, Anthroform (walkers), Exotic Vehicle, Groundcraft (wheeled or tracked), Spacecraft, Watercraft.