Hardwood refinishing is the process of restoring the surface of wooden floors to improve their appearance and extend their lifespan. This typically involves sanding down the existing finish to remove scratches, stains, and imperfections, followed by applying a new coat of finish, such as polyurethane. The refinishing process can enhance the natural beauty of the wood and can be done on various types of hardwood, including oak, maple, and cherry. It is recommended to refinish hardwood floors every 7 to 10 years, depending on wear and tear, to maintain their quality and shine.