Coffee filters are thin, porous papers or materials used to separate coffee grounds from brewed coffee. They allow water to flow through while trapping the solid particles, resulting in a smooth beverage. Filters come in various shapes and sizes, including cone and basket styles, to fit different types of coffee makers. These filters can be disposable or reusable. Disposable filters are typically made from paper, while reusable options are often made from metal or cloth. Using a coffee filter helps improve the taste and clarity of the coffee, making it an essential tool for many coffee enthusiasts.