Aluminum foil is commonly used in cooking and food storage for several purposes. In cooking, it's used to wrap foods like fish or potatoes to retain moisture and flavor during baking or grilling. It can also be used to cover dishes to prevent splatters in the oven or to create a steaming effect. For food storage, aluminum foil is used to wrap leftovers to keep them fresh in the refrigerator or freezer, preventing freezer burn and preserving taste and texture. Additionally, it's used to cover bowls for storage or to create makeshift containers for food items that need to be transported.