A rack-mounted system refers to a type of computer hardware that is designed to be installed in a standardized frame or enclosure known as a rack. These systems are typically used in data centers and server rooms, where multiple devices can be stacked vertically to save space and improve organization. Each unit, often called a server or a network switch, fits into a specific slot in the rack, allowing for efficient cooling and easy access for maintenance. These systems are commonly used in enterprise environments, where they support various applications such as web hosting, data storage, and network management. The standard size for rack-mounted equipment is usually measured in units (U), with one unit being 1.75 inches in height. This modular design allows for scalability, enabling organizations to add or remove components as needed while maintaining a tidy and efficient setup.