Paper filters are thin sheets made from cellulose fibers, commonly used in various applications like brewing coffee and filtering liquids. They work by allowing liquids to pass through while trapping solid particles, ensuring a cleaner end product. In coffee brewing, for example, they help separate the coffee grounds from the brewed liquid, resulting in a smoother taste. These filters come in different shapes and sizes, tailored for specific uses, such as coffee makers or tea brewing. They are typically disposable, making cleanup easy, but some are designed to be reusable. Overall, paper filters are a practical solution for achieving clarity in beverages and other liquids.