What is sharpener?

A sharpener is a tool used to sharpen the edge of a blade or other objects. It is usually used on knives, scissors, and other cutting instruments. The sharpener typically has a series of abrasive surfaces that are used to remove metal from the blade and create a sharp edge. The abrasive surfaces can be made from various materials, such as ceramic, diamond, or metal. The sharpener can be either manual or electric. Manual sharpeners are powered by hand, while electric sharpeners use a motor to rotate the abrasive surfaces.