What is one of the main functions of flaps during approach and landing?

Flaps play a crucial role in enhancing the aerodynamic characteristics of an aircraft during approach and landing. One of their primary functions is to provide an increase in lift at slower airspeeds. When flaps are extended, they change the shape of the wing and increase its camber, which allows the wing to generate more lift without requiring the aircraft to maintain a higher speed. This is particularly important during landing, as pilots often need to descend at a controlled rate while minimizing airspeed to ensure a safe touchdown.

As the aircraft approaches the runway with flaps extended, it can maintain stable flight at lower speeds, which is essential for effective control during the landing phase. The increased lift that flaps provide supports the aircraft's weight without the need to accelerate, allowing for a shallower glide slope and safer landings.

In contrast, some of the other choices are not aligned with how flaps function. Some may suggest that flaps decrease lift or increase drag; however, they primarily work to enhance lift and can also increase drag, but only to the extent that aids in controlling descent and approach stability.