There are many types of trim, here is a basic run down of the main styles and applications: Baseboards: These are the moldings that cover the joint between the wall and the floor, providing a finished look. Crown moldings: These are decorative moldings that are installed where the wall meets the ceiling, adding a touch of elegance and visual interest. Door and window casings: Casings are the moldings that surround doors and windows, providing a transition between the wall and the door or window frame. Wainscoting: Wainscoting is a type of paneling that is installed on the lower part of a wall, typically between the baseboard and the chair rail, adding texture and visual appeal.