Retaining Walls are the types of walls that are rigidly designed and constructed to serve the function of supporting soil vertically so that it can be retained at different levels. Retaining Walls can effectively retain and support sloping soil that otherwise would not be able to naturally stay in that position. Retaining Walls help shape and keep terrain from spreading over areas like roadway overpasses or hillsides. Retaining Walls are also used to shape any terrain within the site of a building. The different types of Retaining Walls include gravity walls, cantilevered walls, diaphragm walls, bored piles, and anchored walls.