"Server virtualization" in IT architecture refers to the technique of running multiple virtual machines (VMs) on a single physical server. This approach optimizes resource utilization, allowing organizations to make better use of hardware capabilities and reduce costs by minimizing the number of physical servers needed. Virtualization allows for easy scaling of applications, separation of environments for testing or development, and simplified disaster recovery processes. It also enhances flexibility, as VMs can be moved or replicated across servers without downtime. Overall, server virtualization is a key component of modern IT infrastructure strategies.