What is the primary purpose of push-back in aviation?

The primary purpose of push-back in aviation is to move the aircraft away from the gate. During the push-back process, a specialized vehicle, known as a push-back tug, connects to the front of the aircraft and gently pushes it back from the terminal. This is necessary because most aircraft are unable to reverse on their own without using their engines, which is not advisable while at the gate due to safety and space constraints.

Once the aircraft is appropriately positioned away from the gate, it can then taxi to the runway for takeoff. This maneuver is a crucial step in the departure process, ensuring that the aircraft is clear of the gate area before it starts its journey on the taxiway. The other options, while related to various aspects of airport operations, do not accurately describe the primary function of the push-back procedure.