PVD (Physical Vapor Deposition) is a coating technology that vaporizes materials in a vacuum environment and deposits them onto substrates through physical methods. The main techniques include evaporation, sputtering, and ion plating. PVD coatings offer high hardness, wear resistance, and corrosion resistance, making them widely used in tools, decorative finishes, electronics, and more. Compared to chemical deposition, PVD is environmentally friendly, produces high-purity films, and is a key surface engineering technology.