Paper filters are thin sheets made from cellulose fibers, commonly used in brewing coffee and tea. They help separate the liquid from the grounds, allowing for a smoother drink. These filters come in various shapes and sizes to fit different brewing devices, such as coffee makers and pour-over cones. In addition to coffee and tea, paper filters are also used in other applications, like laboratory experiments and air filtration systems. They are disposable, making cleanup easy, but they can also be made from biodegradable materials, which is better for the environment.