Baseboard
A popular type of trim that serves as a counterpoint for crown molding. The purpose is to covert joint where the wall meets the floor.
Picture Frame Molding
A decorative type of trim that looks like a picture frame on the wall. Sometimes it is used to frame art, but most of the time it is only used as a focal element.
Panel Molding
Decorative molding used to trim raised panel wall construction. It is installed on paneling rather than directly on the wall.