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QEMU

QEMU is an open source machine emulator and virtualizer.
QEMU stands for Quick Emulator.

Machine emulator

QEMU runs OSes and programs made for one machine (e.g. ARM board) on another machine (e.g. PC).

Virtualizer

Near native performance by executing the guest code.
In Linux, the virtualizer uses Kernel Virtual Machine

Versions

There seem to be two versions

See also

QEMU is used as virtual machine for the Android emulator (AVD)
Oracle VM VirtualBox

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