Rack-mounted servers are computer systems designed to be installed in a standardized frame called a server rack. These servers are typically compact and can be stacked vertically, allowing for efficient use of space in data centers and server rooms. They are commonly used in businesses to manage applications, store data, and support various IT functions. Each rack can hold multiple servers, making it easier to organize and maintain hardware. Rack-mounted servers often come in different sizes, measured in rack units (U), with one rack unit being 1.75 inches high. This design helps optimize cooling and power management in high-density environments.