Why do we need aluminum when cooking in the oven at all.Aluminum foil is an incredibly versatile cooking product as it can take the heat of almost any kind of cooking (stove, oven, grill, firepit), it can be formed into any shape needed. It also retains the juices in the roast while baking, so as to cook completely without burning. Keeps the direct heat off your roast. Catches spillovers from pies, casseroles, stews etc.Function Of Aluminium FoilFoil keeps meat from drying out and hastens cooking time. Also keeps juices from spattering all over the inside of your oven. Plus, when you line a pan with foil, easier to clean pan, especially if you are baking something like cheesy scalloped potatoes.Keeps the top from getting over cooked and the foil keeps the steam in so your food with be moist.keeps the heat and moisture in without meltingOther related question