The technology that allows multiple virtual machines to run on a single physical server is called virtualization. Through hypervisors, such as VMware or Hyper-V, virtualization enables the efficient allocation of hardware resources, improving overall server utilization. This technology allows organizations to consolidate their IT infrastructure, reducing costs and simplifying management. By facilitating the creation and operation of separate environments for different applications and workloads, virtualization enhances flexibility, scalability, and disaster recovery capabilities.