<human>:  With regards to a process called CVD, how does it work?
<bot>: CVD stands for chemical vapor deposition. It’s a process where a material is vaporized and deposited on a substrate. The substrate can be a piece of metal, a semiconductor, or a polymer. The material is vaporized by heating it to a high temperature, and then it is deposited on the substrate. The substrate is usually heated to a lower temperature than the material, so the material is deposited on the substrate.