A panel door is a door with wooden panels and no glass. These doors come in multiple layouts and designs and are used as Exterior doors and Interior doors. The panels can be flat or profiled around the edges (raised panel). Just as in french doors the door Stiles and rails have profiled edges that hold the panel. Panel doors can also be constructed with Raised decorative moulding applied on both sides to hold the panels instead of using the edge profile on the Stiles and rails.
A panel door with raised moulding
A panel door with Sticking detail