A screw cap is a type of closure used primarily for bottles, allowing for easy opening and resealing. Unlike traditional corks, screw caps are made from metal or plastic and feature a threaded design that securely fits onto the bottle's neck. This design helps preserve the contents, making it popular for beverages like wine, water, and soft drinks. Screw caps are valued for their convenience and effectiveness in preventing leaks and contamination. They are also considered more user-friendly, as they do not require a corkscrew for opening. Many winemakers have adopted screw caps to ensure consistent quality and freshness in their products.