The four major systems in a commercial kitchen are: Food Preparation System: This includes all the equipment and tools needed to prepare ingredients for cooking, such as slicers, mixers, food processors, and prep tables. Cooking System: The cooking system consists of the appliances used to cook food, like ovens, ranges, grills, fryers, and steamers. Refrigeration System: Commercial refrigerators, freezers, and walk-in coolers are essential for keeping ingredients and prepared foods fresh and safe. Service System: This includes equipment used to store, transport, and serve food, such as hot and cold holding units, serving lines, and point-of-sale systems.