Bunk beds are a type of bed that consists of two or more sleeping surfaces stacked on top of each other. They are commonly used in children's rooms, dormitories, and hostels to save space. The upper bed is accessed by a ladder, while the lower bed is usually at floor level. Bunk beds can come in various styles and materials, including wood and metal. These beds are popular for their ability to accommodate multiple sleepers in a compact area. Some bunk beds also feature additional storage options, such as drawers or shelves, making them practical for small living spaces. They are often designed with safety features like guardrails to prevent falls from the upper bunk.