Why are walls bumpy?

Walls can be bumpy due to various reasons, including the materials used in their construction, settling of the building, or imperfections in the finishing process. Textured finishes, like stucco or certain paints, are intentionally applied to create a decorative effect. Additionally, uneven surfaces can result from wear and tear over time or from moisture damage. These bumps can affect both the aesthetic appeal and the functionality of the wall.