Surface wear refers to the gradual degradation of a material's surface due to friction, abrasion, or chemical reactions. This process can occur in various materials, including metals, plastics, and ceramics, and is often influenced by factors such as load, speed, and environmental conditions. Common examples of surface wear include the scratching of a smartphone screen or the erosion of road surfaces from vehicle traffic. Over time, surface wear can lead to reduced performance, structural integrity, and aesthetic appeal, making it an important consideration in fields like engineering and manufacturing.