Retaining walls are a landscape structure that is generally based on a block system. These retaining wall blocks are installed using an interlocking system to form the wall structure. Retaining walls are usually made from stone, concrete, masonry, brick, steel or wood.
Retaining walls are built to form a structure to hold back soil or rock from any type of building or property. Retaining walls can be built for decorative appeal in landscaped gardens, but they are generally installed to prevent erosion, provide support for grade changes in land and to prevent down slope movement.