Refinishing techniques involve restoring the surface of furniture or other wooden items to improve their appearance and extend their lifespan. Common methods include sanding, staining, and applying a protective finish. Sanding removes old paint or varnish, while staining enhances the wood's natural color and grain. After staining, a protective finish, such as polyurethane or varnish, is applied to seal the wood and provide durability. These techniques can be used on various items, including tables, chairs, and cabinets, making them look new again while preserving their original character.