Why do we use aluminum foil for cooking food?
Answer:
Aluminum foil is an incredibly versatile cooking product. It can take the heat of almost any kind of cooking (stove, oven, grill, firepit), it can be formed into any shape needed, it can handle a bit of steam pressure when folded properly, it's lightweight, it's affordable, and it can be recycled.
It is not actually Aluminium but an alloy of Aluminium[90%] and other metals[10%] that stop Aluminium from "rusting/oxidising" and exploding on contact with water and heat. Aluminium is lightweight, very malleable[so you can bend it], cheap compared with other metals, recyclable and easily drawn into thin sheets.