Rack-mounted enclosures are specialized cabinets designed to hold and organize electronic equipment, such as servers, networking devices, and storage systems. These enclosures fit into standard 19-inch racks, allowing for efficient use of space in data centers and server rooms. They provide protection, cooling, and easy access to the equipment housed within. Typically made of metal, rack-mounted enclosures come in various heights, measured in rack units (U), with one rack unit being 1.75 inches. They often include features like adjustable shelves, cable management systems, and ventilation options to ensure optimal performance and organization of the equipment.