An emery board is a small, flat tool used for filing and shaping nails. It is typically made of a thin piece of cardboard or wood coated with a rough material, often emery, which is a type of abrasive. Emery boards come in various grits, allowing users to smooth rough edges or shape nails to their desired length and style. These tools are commonly found in beauty kits and salons, making them popular for both personal and professional use. They are easy to handle and can be used on both fingernails and toenails. Regular use of an emery board can help maintain healthy and well-groomed nails.