If your yard has any slope, drainage issues, or uneven grading, you've probably wondered whether a retaining wall is worth it. Here's what a retaining wall actually does, and how to know if your property needs one. What Does a Retaining Wall Do? A retaining wall holds back soil on a slope, preventing erosion and creating a level, usable space where there wasn't one before. Beyond function, retaining walls are also used to define outdoor living spaces — like framing a patio, g