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Server Virtualization refers to the process of creating a simulated, or virtual, computing environment as opposed to a physical one. It involves partitioning a single server into multiple virtual servers, each running its own operating system and applications. This allows for better utilization of resources, increased flexibility, and improved disaster recovery capabilities. In the context of Linux System Administration, Server Virtualization can involve using software such as KVM, Xen, or VMware to create and manage these virtual environments. It is a key aspect of modern data center management and cloud computing, allowing for the efficient use of resources and the ability to quickly provision and deprovision servers as needed.