A sideboard, also called as a buffet, is a piece of furniture, usually a long low cabinet, used for storage and display in a dining room or kitchen. Generally, sideboards are made of wood and metal, but now for the modern style, some sideboards would come with marble or sintered stone, even glass tabletop to bring the chic vibe to the interior space.
Actually, it is a versatile furniture pieces so you can even place it in the living room as a side cabinet or a TV credenza; or get it into the entryway as a console table; etc.
See more about the differences of sideboard, buffet and hutch.