What does drone headless mode mean?

The headless mode of UAV is heading locking mode, moving in the direction of takeoff.

In this mode, the UAV moves according to the position when the mode is turned on, ignoring the horizontal rotation direction environment. There are no concepts such as "head", "tail", "left" and "right", only the position changes without the direction changes. During the flight, you can focus more on controlling the distance and height of movement without worrying about which direction to go forward or backward.