Buffet, sometimes called buffet dinner, is an informal western-style banquet which is widely used in the world at present, especially in large-scale business activities. Its specific practice is that instead of preparing dinner, the diners choose their own food and drink at the meal, and then stand or sit down, and eat freely with others or alone. Buffet is called buffet, mainly because it can arouse the subjective initiative of diners when eating, and they can help themselves and arrange and choose dishes within the established scope. As for it, it is also called a cold dinner party, mainly because the food it provides is mainly cold food.