A sharpening stone, also known as a whetstone, is a tool used to sharpen the edges of blades, such as knives and scissors. It is typically made from materials like alumina oxide, silicon carbide, or natural stones. The surface of the stone is abrasive, allowing it to grind away metal from the blade, creating a sharper edge. Sharpening stones come in various grits, which indicate their coarseness. Lower grit stones are used for repairing dull or damaged edges, while higher grit stones refine and polish the blade. Proper use of a sharpening stone can enhance the performance and longevity of cutting tools.