Composite films are materials made by combining two or more different substances to enhance their properties. These films often consist of layers that can include polymers, metals, or ceramics, which work together to provide benefits like increased strength, flexibility, or resistance to moisture and chemicals. The use of composite films is common in various industries, including packaging, electronics, and automotive. For example, they can be used in food packaging to extend shelf life or in electronic devices to improve durability. Their versatility makes them valuable in many applications where traditional materials may fall short.