Roughness refers to the texture of a surface that is uneven or irregular. It can be measured in various ways, often using tools that assess the height and depth of surface features. Rough surfaces can affect how materials interact, influencing friction, adhesion, and wear. In nature, roughness is commonly found in materials like rocks or wood, where the surface has bumps, grooves, or other irregularities. In engineering, understanding roughness is crucial for applications such as aerodynamics and manufacturing, where surface texture can impact performance and efficiency.