Vials are small containers typically made of glass or plastic, designed to hold liquids or powders. They are commonly used in laboratories, pharmacies, and medical settings to store samples, medications, or chemicals safely. Vials often come with secure caps or seals to prevent contamination and ensure the integrity of their contents. In the pharmaceutical industry, vials are essential for packaging vaccines, injectable drugs, and other sterile products. They can vary in size and shape, with some designed for single-use while others can be resealed. Proper labeling and storage of vials are crucial for maintaining safety and efficacy in their use.