A whetstone is a tool used for sharpening blades, such as knives and scissors. It is typically made from materials like ceramic, diamond, or natural stone. Whetstones come in various grits, which indicate their coarseness; lower grits are used for repairing damaged edges, while higher grits refine the blade for a smooth finish. To use a whetstone, the blade is drawn across the surface at a specific angle, usually between 15 to 20 degrees. Regular maintenance with a whetstone can enhance the performance of cutting tools, making them safer and more efficient. Proper care of knives and scissors is essential for longevity.