An oilstone is a type of sharpening stone used to hone the edges of tools and blades. It is typically made from materials like aluminum oxide or silicon carbide and is lubricated with oil during the sharpening process. This lubrication helps to reduce friction and prevent the stone from clogging with metal particles. Oilstones come in various grits, allowing users to achieve different levels of sharpness. They are commonly used by woodworkers, chefs, and anyone who needs to maintain sharp tools. Proper care and maintenance of an oilstone can extend its lifespan and effectiveness in sharpening.