Chrome is a very shiny layer of metallic coating that's applied to a metal surface. When you clean your bathroom, you might polish the chrome faucet until it gleams.
Some cars have chrome details, like a chrome bumper or chrome wheels, and kitchen and bathroom fixtures can be made of chrome as well. Rather than being one type of solid metal, things made of chrome are generally coated with chromium plate as a protective or decorative layer. The word chrome comes from the element chromium, which is rooted in the Greek khroma, "color."