A hollow core door is a type of interior door that features a lightweight construction. It consists of a thin outer layer, usually made of wood or a composite material, with a hollow interior. This design makes the door easier to handle and install while providing adequate sound insulation and privacy. Hollow core doors are commonly used in residential and commercial buildings due to their affordability and versatility. They come in various styles and finishes, allowing them to complement different interior designs. Despite being lightweight, they are generally durable and can withstand everyday use.