A vial is a small container, typically made of glass or plastic, used to hold liquids or powders. Vials are commonly used in laboratories, pharmacies, and medical settings to store samples, medications, or chemicals safely. They often come with a secure cap or stopper to prevent contamination and evaporation. Vials can vary in size and shape, depending on their intended use. Some vials are designed for single-use, while others can be sealed and reused. They are essential in various fields, including pharmaceuticals, biotechnology, and research, ensuring that substances remain stable and uncontaminated until needed.