A retaining wall is a structure designed to hold back soil and prevent erosion on sloped land. These walls are commonly made from materials like concrete, stone, or timber and are used in various settings, including gardens, roads, and buildings. They help create flat areas on uneven terrain, making it easier to use the land for different purposes. Retaining walls work by counteracting the pressure of the soil behind them. They can be built in different styles, such as gravity walls, cantilever walls, and anchored walls, depending on the specific needs of the site. Proper drainage is also essential to ensure the wall's stability and longevity.