Nail files are tools used to shape and smooth the edges of nails. They come in various materials, including emery board, glass, and metal, each offering different levels of abrasiveness. Nail files are commonly used in both manicures and pedicures to achieve a polished look. Using a nail file involves gently rubbing the file against the nail's edge in one direction to prevent splitting. Regular use can help maintain nail health and appearance. Nail files are often found in beauty salons, but they are also popular for personal grooming at home.