Recessed hinges, also known as inset hinges, are a type of hinge used to attach doors or other moving objects to a fixed base. They are named for their shape, as they are built into the door or object and are not visible from the outside. Recessed hinges are usually made of metal, such as steel, stainless steel, or aluminum, and can be coated with a protective layer to prevent rusting. They are a popular choice for doors or other objects that have a sleek, professional appearance, as they are not visible from the outside. Recessed hinges are also easy to install and replace and are available in various sizes and styles to meet the needs of different applications.