5 QEMU is a generic and open source machine emulator and virtualizer.
7 QEMU can be used in several different ways. The most common is for
8 :ref:`System Emulation`, where it provides a virtual model of an
9 entire machine (CPU, memory and emulated devices) to run a guest OS.
10 In this mode the CPU may be fully emulated, or it may work with a
11 hypervisor such as KVM, Xen, Hax or Hypervisor.Framework to allow the
12 guest to run directly on the host CPU.
14 The second supported way to use QEMU is :ref:`User Mode Emulation`,
15 where QEMU can launch processes compiled for one CPU on another CPU.
16 In this mode the CPU is always emulated.
18 QEMU also provides a number of standalone :ref:`command line
19 utilities<Tools>`, such as the ``qemu-img`` disk image utility that
20 allows you to create, convert and modify disk images.