Aluminium foil supplanted tin foil in the mid 20th century. In the United Kingdom and United States it is often informally called “tin foil”, just as steel cans are often still called "tin cans"). Metallised films are sometimes mistaken for aluminium foil, but are actually polymer films coated with a thin layer of aluminium. In Australia, aluminium foil is widely called alfoil.Tin-foil is widely used in the baking and grilling industries. It is an indispensable necessity for the family.