A rack server is a type of computer designed to be mounted in a framework called a rack. These servers are typically 1U to 4U in height, where "U" stands for "rack units," and each unit is 1.75 inches tall. Rack servers are commonly used in data centers because they save space and allow for efficient cooling and power management. These servers can host various applications and services, making them suitable for businesses of all sizes. They often come with multiple processors, large amounts of memory, and storage options, enabling them to handle demanding workloads. Rack servers are an essential component of modern IT infrastructure, supporting technologies like cloud computing and virtualization.