The document discusses server virtualization and its benefits. It notes that traditionally, servers have low utilization rates, with 20% running below 0.5% utilization and 75% below 5% utilization. This leads to underutilization of resources, increased costs, and management complexity. Virtualization addresses these issues by allowing multiple virtual servers to run on single physical servers, improving utilization rates and reducing costs, energy usage, and space needs. It discusses the differences between full and para-virtualization, and how virtualization provides hardware independence, isolation, and encapsulation. Common uses of virtualization include server, desktop, and application virtualization.