Exterior trim refers to the decorative and functional elements found on the outside of a building. It includes features like window and door casings, fascia boards, and soffits. These components enhance the overall appearance of a structure while also providing protection against the elements. Typically made from materials such as wood, vinyl, or composite, exterior trim can be painted or stained to match the building's color scheme. Proper installation and maintenance of exterior trim are essential for preventing water damage and ensuring the longevity of the building's exterior.