A "liner" typically refers to a type of ship designed for transporting passengers and cargo across oceans. These vessels are often large and equipped with various amenities to ensure comfort during long journeys. Liners operate on scheduled routes, connecting different ports and providing essential services to travelers. In a different context, "liner" can also refer to a material used to cover or protect the interior of an object, such as a bag or container. Liners help maintain the integrity of the item, prevent damage, and can enhance its appearance. They are commonly made from materials like plastic, fabric, or paper.