Trim work refers to the finishing touches in a building's interior or exterior, typically involving the installation of decorative moldings and casings. This includes elements like baseboards, crown molding, and window casings, which enhance the aesthetic appeal of a space while also covering gaps between surfaces. In addition to aesthetics, trim work serves a practical purpose by protecting walls and providing a polished look to doorways and windows. It can be made from various materials, including wood, MDF, or vinyl, and can be painted or stained to match the overall design of a room.