A stopper, also known as a closure, is a device used to seal the opening of a container, preventing the contents from spilling or becoming contaminated. Stoppers can be made from various materials, including rubber, cork, or plastic, and are commonly found in bottles, jars, and tubes. They come in different shapes and sizes to fit specific containers and ensure a secure seal. In addition to their practical use, stoppers can also serve decorative purposes. For example, wine bottle stoppers often feature unique designs and materials, enhancing the aesthetic appeal of the bottle. Overall, stoppers play a crucial role in preserving the quality and safety of the contents they protect.