Coating refers to the application of a layer of material on a surface to enhance its properties or appearance. This process can protect items from damage, improve their durability, or provide a decorative finish. Common examples of coatings include paint on walls, varnish on wood, and protective layers on metal surfaces to prevent rust. Different types of coatings serve various purposes. For instance, powder coating is often used for metal objects to create a tough, colorful finish, while ceramic coatings are popular in the automotive industry for protecting car paint. Overall, coatings play a vital role in both functionality and aesthetics.