A screw cap is a lid or cap that fastens onto a container by rotating along a threaded neck. In food and drink it closed the era of the corkscrew-only bottle: screw caps seal wine, spirits, oils, and sauces with a tamper-evident ring that breaks on first opening, proving the pack is intact. Modern wine screw caps use liners engineered to control oxygen transfer, and blind tastings show quality wines age well under them, though tradition keeps cork dominant for fine wine. For jars and bottles the screw cap gives a reliable, resealable hermetic seal that consumers open and close daily. Its virtues are consistency, convenience, and the end of cork taint, at the cost of a little ceremony.