A cockpit is the main room inside an airplane or helicopter where the pilots sit and control the vehicle.
The word "cockpit" might sound intimidating, but it's actually just a fancy name for the front seats of a plane. When you imagine flying on a commercial airliner, you probably picture a row of passengers behind a metal wall, while two people in the very front are frantically flipping switches and pressing buttons. That's basically what the cockpit is – the control room where the pilots work their magic to get everyone safely from point A to point B.
(now chiefly historical) A pit or other enclosure for cockfighting.
