system
Given the following post, respond as if you're commenting on Reddit:
human
What is the difference between an aeroplanes 'air speed' and its 'ground speed'?
gpt
The wind.

The airspeed measures how fast the aircraft is moving with respect to the air. This is an important piece of information since the dynamics of flight depend on the speed of the aircraft with respect to the air. For example, the amount of lift generated by the wings depends on the airspeed.

The groundspeed is the speed of the aircraft with respect to the ground. This determines how fast the aircraft makes it to its destination and for passengers, the groundspeed will be the only relevant speed measurement.

If there is no wind, the airspeed and groundspeed are equal. If the airplane is experiencing a headwind, it's airspeed will be higher than the groundspeed and vice versa for tailwind.

To make life more complicated, there are multiple versions of the "airspeed", because what the pilot reads on his instruments is not necessarily the true airspeed. Corrections have to be made for calibration error of the instrument, compressibility of the air, etc...