What is what does ledge means?

A ledge is a narrow or projecting part of a surface that forms a shelf or a projection. It usually refers to a flat, horizontal shelf-like surface that extends out from a vertical wall or cliff face. Ledges can vary in size and shape, and can be made of different materials. They can be found in natural geological formations, such as mountains and cliffs, as well as in man-made structures, such as buildings and bridges. Ledges are also used in various activities, such as rock climbing, where they provide a foothold or handhold for climbers.