Ampoules are small sealed vials that contain liquids, typically used for storing pharmaceuticals, vaccines, or other sensitive substances. They are made from glass or plastic and are designed to protect their contents from contamination and degradation. Ampoules are often broken open at the neck to access the liquid inside, making them a common choice for single-use applications in medical and laboratory settings. In addition to their use in medicine, ampoules can also be found in the beauty industry, where they hold concentrated serums or treatments. These beauty products are often marketed for their effectiveness and convenience, allowing users to apply potent ingredients directly to the skin.