Paper liners are thin sheets made from paper that are used to line baking pans, muffin tins, or other cooking vessels. They help prevent food from sticking, making it easier to remove baked goods like muffins and cupcakes. Additionally, they can simplify cleanup by catching crumbs and grease. These liners come in various sizes and designs, including plain, patterned, or even decorative options. They are often made from greaseproof or parchment paper, which can withstand high temperatures. Using paper liners is a popular practice in both home and professional kitchens to ensure consistent baking results.