Linux System - Table 12 > Packages - Table 1 & 2 > xen

\"Xen is a virtual machine monitor for x86 (others being worked) thatsupports execution of multiple guest operating systems withunprecedented levels of performance and resource isolation. Moderncomputers are sufficiently powerful to use virtualization to presentthe illusion of many smaller virtual machines (VMs), each running aseparate operating system instance. Successful partitioning of amachine to support the concurrent execution of multiple operatingsystems poses several challenges.\"