System of serving meals in which food is placed in a public area where the diners generally serve themselves
A buffet can be either a sideboard (a flat-topped piece of furniture with cupboards and drawers, used for storing crockery, glasses, and table linen) or a system of serving meals in which food is placed in a public area where the diners serve themselves. A form of service à la française, buffets are offered at various places including hotels, restaurants, and many social events. Wikipedia