This ideally refers to a buffet or sideboard. The term is also used to describe a sideboard cupboard in the dining room. It is generally made of wood and has a top made of glass, stone or marble. This piece of furniture became very popular in the US in the latter half of the 19th century.
In modern times, a credenza is more often a type of sideboard used in the home or restaurant. In dining rooms, it is typically made from wood and used as a platform to serve buffet meals. In restaurant kitchens, credenza tables are generally made from stainless steel. It provides a side surface and many things can be stored on it.