What is terminology used in reference to the foodservise industry describe area where guests are generally not allowed such as kitchen?

The term "back of the house" is commonly used in the foodservice industry to refer to those areas of a restaurant that are not typically accessible to guests. This includes the kitchen, food preparation areas, storage areas, and other areas where employees work to prepare and serve food. In contrast, the "front of the house" refers to the areas where guests are served, such as the dining room, bar, and reception area.