Kernel based Virtulization. Provided in all Linux type OS, with built in packages , like to jave KVM in RHEL6 yum install qemu-kvm qemu-img These packages provide the user-level KVM emulator and disk image manager on the host Red Hat Enterprise Linux system # yum install virt-manager libvirt libvirt-python python-virtinst libvirt-client python-virtinst: Provides the virt-install command for creating virtual machines. libvirt: to talk to RHEL KVM, via commands like "libvirtd" to VM mamager #virt-mamager & a graphical tool of KVM to manage the VMS With virt-manager, graphically step by step wizard, you can create VMs, provide image , choose type of OS,. Take snapshot, revert back on any image, it's like a VCenter. #Daemon #libvirtd use other commands on host mamanger like #virsh list --all #virsh domaininfo <vmname> // info and confi of your vm