Screw caps are closures used primarily for bottles, especially in the wine and beverage industry. They are designed to twist on and off, providing a secure seal that helps preserve the contents inside. Unlike traditional corks, screw caps are often made from metal or plastic and can be easier to open and reseal. These caps offer several advantages, including preventing oxidation and contamination, which can affect the quality of the liquid. Many winemakers, including those producing white wine and red wine, have adopted screw caps for their convenience and effectiveness in maintaining freshness over time.