A razor sharpener is a tool used to sharpen and maintain the sharpness of a razor blade. It typically consists of four components: a honer, a STROP, a STRAP, and a HONE. A honer is a device used to sharpen the blade by removing metal from the edge. A STROP is a leather or canvas belt that is used to further refine the blade's edge. A STRAP is a piece of leather or canvas that is used to hold the honer in place. Finally, a HONE is a block of stone or metal that is used to further refine the blade's edge. All of these components work together to keep a razor blade sharp and ready for use.