What is the purpose of high drag devices like spoilers and flaps?

High drag devices such as spoilers and flaps are primarily used to increase drag during specific phases of flight, which can be beneficial for various reasons. When these devices are deployed, they alter the airflow over the wing and increase the overall drag on the aircraft. This increase in drag can help the aircraft slow down, which is particularly useful during landing and approach phases. By enhancing drag, these devices allow pilots to control the aircraft’s descent rate and approach speed more effectively, facilitating a smoother landing.

Additionally, high drag devices can also improve the aircraft's performance in low-speed conditions, allowing for better handling and reduced stall speeds. In this context, the use of drag is not merely a byproduct but a designed effect that aids in the safe management of the aircraft during critical stages of flight.