What is a peneplain How is it different from a pediplain?

A peneplain is a nearly level land surface that has been eroded to a low relief, typically formed over long geological time scales through processes like weathering and erosion. It represents a mature stage of landscape development where the topography is subdued. In contrast, a pediplain is a flat or gently sloping area formed by the coalescence of pediments, which are broad, sloping surfaces at the base of mountains. While both features are related to erosion, peneplains are more ancient and represent a more advanced stage of erosion compared to the relatively younger and actively forming pediplains.