A bunk bed is a type of bed that consists of two or more sleeping surfaces stacked on top of each other. This design saves space, making it ideal for small rooms or shared bedrooms. Bunk beds are commonly used in homes, dormitories, and camps, providing a practical sleeping solution for multiple people. Typically, the upper bed is accessed by a ladder, while the lower bed is at ground level. Bunk beds can come in various styles and materials, including wood and metal. Some models also include additional features like built-in storage or desks, enhancing their functionality in a compact area.