Why not?

It’s extremely cheap, works well for autoclaving and freezing and is a non porous barrier for storing materials

It's cheap and can be thrown away afterwards. It is reasonably chemically inert. Its waterproof. It can mould to any shape vessel and its autoclavable.

Provide sterile environment for experiments and prevent contamination.

Sanam Ashraf why not we use another type of metals foil why this?for example we can use lithium foil,or silver foil? why not we use lithium or silver foils or anyb other metals foil?

Syed Meesam Raza

In addition to Victoria's excellent points --

Other metals foils are not readily available and, if they were, profoundly more costly.

Here's some history of its development and use https://manyeats.com/history-of-aluminum-foil/

Lithium and silver foils may not be as inert or may be more reactive with certain biological materials, making them unsuitable for microbiology applications.

Ideal for a wide range of laboratory uses, such as capping corks, , preventing leaks, halting evaporation or heat loss, and closing bottles and culture tubes. Suitable for autoclave usage. Suitable for covering autoclaving and incubation vessels

Resistant to heat and humidity and therefore suitable for autoclaving and sterilization.