A kitchen is a room or part of a room used for cooking and food preparation in a dwelling or in a commercial establishment. A modern middle-class residential kitchen is typically equipped with a stove and sink with hot and cold running water, a refrigerator and worktops and kitchen cabinets arranged according to a modular design. Many households have a microwave oven, a dishwasher, and other electric appliances. The main functions of a kitchen are to store, prepare and cook food. The room or area may also be used for dinning (or small meals such as breakfast). The design and construction of kitchens is a huge market all over the world.