Cork stoppers are small plugs made from the bark of the cork oak tree, primarily found in Mediterranean regions. They are widely used to seal bottles, especially for wine, to prevent air from entering and spoiling the contents. Cork is a natural, renewable material that is lightweight, flexible, and impermeable, making it ideal for this purpose. In addition to wine bottles, cork stoppers are also used in various other containers, such as spirits and olive oil. The unique properties of cork allow it to expand and create a tight seal, ensuring the freshness and quality of the liquid inside.