A wax melt warmer looks like a decorative ceramic vase with a dish on top.   The base of the vase has an opening for a tea light or a votive candle, or plugs into an electric socket to heat the upper tray.  Wax melts  (cubes, custom designs) are placed in the top of the dish and gently warms until they become liquefied.  As they melt they release the melts fragrance.