Barrier films are specialized materials designed to prevent the passage of gases, moisture, and other substances. They are commonly used in packaging to protect food and pharmaceuticals from spoilage and contamination. These films can be made from various materials, including plastics and metals, and are engineered to provide specific protective properties. In addition to packaging, barrier films are also utilized in industries like electronics and construction. For example, they can be used to protect sensitive components from moisture or to create vapor barriers in buildings. Overall, barrier films play a crucial role in extending the shelf life of products and ensuring their safety.